Name:Hiroshi G. Takahashi, Doctor of Science

Assistant Professor
Department of Geography, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University.
e-mail : hiroshi3 ~at~ tmu.ac.jp
additional post:
Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

Asian Monsoon, Climate System, Regional Climate Modeling (Downscaling), Land-Ocean-Atmosphere Interaction, Cloud-Precipitation-Aerosol Interaction.

Publications (Peer-Reviewed Papars)

  1. Sugimoto, S., H. G. Takahashi, and H. Sekiyama, 2019: Modification of Near-Surface Temperature Over East Asia Associated With Local-Scale Paddy Irrigation. J. Geophys. Res. Atmos., 124, 2665-2676, doi:10.1029/2018JD029434.[Web Page]

  2. Takahashi, H. G., and J. Polcher, 2019: Weakening of rainfall intensity on wet soils over the wet Asian monsoon region using a high-resolution regional climate model. Progress in Earth and Planetary Science, 6, 26, doi:10.1186/s40645-019-0272-3.[Web Page]

  3. Kamizawa, N., and H. G. Takahashi, 2018: Projected Trends in Interannual Variation in Summer Seasonal Precipitation and Its Extremes over the Tropical Asian Monsoon Regions in CMIP5. J. Climate, 31, 8421-8439, doi:10.1175/JCLI-D-17-0685.1. [Web Page]

  4. Takahashi, H.G., Watanabe, S., Nakata, M., and Takemura, T. 2018: Responseof the atmospheric hydrological cycle over the tropical. Progress in Earth and Planetary Science (PEPS), 5, 44, https://doi.org/10.1186/s40645-018-0197-2. [Web Page]

  5. Takahashi, H. G., 2018: A Systematic Tropospheric Dry Bias in the Tropics in CMIP5 Models: Relationship between Water Vapor and Rainfall Characteristics. Journal of the Meteorological Society of Japan. Ser. II, 96, 4, 415-423, doi:10.2151/jmsj.2018-046. [Web Page]

  6. Takahashi, H.G., and J. Mae B. Dado, 2018: Relationship between Sea Surface Temperature and Rainfall in the Philippines during the Asian Summer Monsoon. J. Meteor. Soc. Japan. Ser. II, 96, 3, 283-290, doi:10.2151/jmsj.2018-031. [Web Page]

  7. Dado, J.M.B., and H.G. Takahashi, 2017: Potential impact of sea surface temperature on rainfall over the western Philippines. Progress in Earth and Planetary Science (PEPS), 4, doi:10.1186/s40645-017-0137-6.
    [abstract]

  8. Sugimoto, S., and H.G. Takahashi, 2017: Seasonal Differences in Precipitation Sensitivity to Soil Moisture in Bangladesh and Surrounding Regions. J. Climate, 30, 921-938, doi:10.1175/jcli-d-15-0800.1. [abstract] [pdf]

  9. Takahashi, H.G., 2016: Seasonal and diurnal variations in rainfall characteristics over the tropical Asian monsoon region using TRMM-PR data. SOLA (Scientific Online Letters on the Atmosphere), 12A, 22-26, doi:10.2151/sola.12A-005. (Accepted on Aug., 2016) [abstract] [pdf]

  10. Ono, M., and H.G. Takahashi, 2016: Seasonal transition of precipitation characteristics associated with land surface conditions in and around Bangladesh. J. Geophys. Res. Atmos., 121, 11,190-111,200, doi:10.1002/2016JD025218. [abstract] [pdf]

  11. Adachi S.A, F. Kimura, H.G Takahashi, M. Hara, X. Ma, and H. Tomita, 2016: Impact of high-resolution sea surface temperature and urban data on estimations of surface air temperature in a regional climate. J. Geophys. Res., 121, 10,486-410,504, doi:10.1002/2016JD024961. [abstract] [pdf]

  12. Sugimoto, S., and H.G. Takahashi, 2016: Effect of Spatial Resolution and Cumulus Parameterization on Simulated Precipitation over South Asia. SOLA (Scientific Online Letters on the Atmosphere), 12A, 7-12, doi:10.2151/sola.12A-002. [abstract] [pdf]

  13. Tanaka, K., T. Chatchai, W. Decha, N. Tanaka, H.G. Takahashi, N. Yoshifuji, Y. Igarashi, T. Sato, and M. Suzuki, 2015: Earlier Leaf Flush Associated with Increased Teak Defoliation. Forest. Sci., 61, 1009-1020, doi:10.5849/forsci.15-004. (Published on Dec. 20, 2015) [Web Page]

  14. Takahashi, H.G., S.A. Adachi, T. Sato, M. Hara, X. Ma, and F. Kimura, 2015: An Oceanic Impact of the Kuroshio on Surface Air Temperature on the Pacific Coast of Japan in Summer: Regional H2O Greenhouse Gas Effect. J. Climate, 28, 7128-7144, doi:10.1175/jcli-d-14-00763.1. (Published on Sep., 2015) [abstract] [pdf, open access!!]

  15. Kodama, C., Y. Yamada, A. Noda, K. Kikuchi, Y. Kajikawa, T. Nasuno, T. Tomita, T. Yamaura, H.G. Takahashi, M. Hara, Y. Kawatani, M. Satoh, and M. Sugi, 2015: A 20-year climatology of a NICAM AMIP-type simulation. J. Meteor. Soc. Japan Ser. II, 93, 393-424, doi:10.2151/jmsj.2015-024. (Published on Aug., 2015) [abstract] [pdf]

  16. Takahashi, H.G., H. Fujinami, T. Yasunari, J. Matsumoto, and S. Baimoung, 2015: Role of tropical cyclones along the monsoon trough in the 2011 Thai flood and interannual variability. J. Climate, 28, 1465-1476, doi:10.1175/jcli-d-14-00147.1. (Accepted on Nov. 6, 2014) [abstract] [pdf, open access!!]

  17. Yamaji, M., and Takahashi, H.G., 2014: Asymmetrical interannual variation in aerosol optical depth over the tropics in terms of aerosol-cloud interaction. SOLA (Scientific Online Letters on the Atmosphere), 10, 185-189, doi:10.2151/sola.2014-039. (Accepted on Oct. 27, 2014) [abstract] [pdf]

  18. Yamashima, R., J. Matsumoto, K. Takata, and H.G. Takahashi, 2014: Impact of historical land-use changes on the Indian summer monsoon onset. Int. J. Climatol., 35, 2419-2430, doi:10.1002/joc.4132. [abstract] [pdf]

  19. Villafuerte II, M. Q., J. Matsumoto, I. Akasaka, H.G. Takahashi, H. Kubota, and T. A. Cinco, 2014: Long-term trends and variability of rainfall extremes in the Philippines. Atmos. Res., 137, 1-13, doi:https://doi.org/10.1016/j.atmosres.2013.09.021. [abstract, pdf]

  20. Takahashi, H.G., and Idenaga, T., 2013: Impact of SST on Precipitation and Snowfall on the Sea of Japan Side in the Winter Monsoon Season: Timescale Dependency. J. Meteor. Soc. Japan Ser. II, 91, 639-653, doi:10.2151/jmsj.2013-506. (Accepted on Jul. 9, 2013) [abstract] [pdf]

  21. Ma, X., H. Kawase, S. Adachi, M. Fujita, H.G. Takahashi, M. Hara, N. Ishizaki, T. Yoshikane, H. Hatsushika, Y. Wakazuki, and F. Kimura, 2013: Simulating river discharge in a snowy region of Japan using output from a regional climate model. Adv. Geosci., 35, 55-60, doi:10.5194/adgeo-35-55-2013. [abstract] [pdf]

  22. Takahashi, H.G., N. N. Ishizaki, H. Kawase, M. Hara, T. Yoshikane, X. Ma, and F. Kimura, 2013: Potential impact of sea surface temperature on winter precipitation over the Japan Sea side of Japan: A regional climate modeling study. J. Meteor. Soc. Japan Ser. II, 91, 471-488, doi:10.2151/jmsj.2013-404. (Accepted on Apr. 27, 2013). [abstract] [pdf]

  23. Fujita, M., H.G. Takahashi, and M. Hara, 2013: Diurnal cycle of precipitation over the eastern Indian Ocean off Sumatra Island during different phases of Indian Ocean Dipole. Atmos. Sci. Lett., 14, 153-159, doi:10.1002/asl2.432. (Accepted on Apr. 1, 2013) [abstract] [pdf]

  24. Tanaka, K., H.-J. Kim, K. Saito, H.G. Takahashi, M. Watanabe, T. Yokohata, M. Kimoto, K. Takata, and T. Yasunari, 2012: How have both cultivation and warming influenced annual global isoprene and monoterpene emissions since the preindustrial era? Atmos. Chem. Phys., 12, 9703-9718, doi:10.5194/acp-12-9703-2012. [abstract] [pdf]

  25. Takahashi, H.G., 2012: Orographic low-level clouds of Southeast Asia during the cold surges of the winter monsoon. Atmos. Res., 131, 22-33, doi:http://dx.doi.org/10.1016/j.atmosres.2012.07.005. (Accepted on Jul. 6, 2012) [abstract] [pdf]

  26. Takahashi, H.G., 2011: Long-term changes in rainfall and tropical cyclone activity over South and Southeast Asia. Adv. Geosci., 30, 17-22, doi:10.5194/adgeo-30-17-2011. (Accepted on Apr. 26, 2011) [abstract] [pdf]

  27. Takahashi, H.G., Y. Fukutomi, and J. Matsumoto, 2011: The impact of long-lasting northerly surges of the East Asian winter monsoon on tropical cyclogenesis and its seasonal march. J. Meteor. Soc. Japan Ser. II, 89A, 181-200, doi:10.2151/jmsj.2011-A12. (Accepted on Nov. 12, 2010) Special issue on MAHASRI. [abstract] [pdf]

  28. Takahashi, H.G., 2010: Seasonal changes in diurnal rainfall cycle over and around the Indochina Peninsula observed by TRMM-PR. Adv. Geosci., 25, 23-28, doi:10.5194/adgeo-25-23-2010. (Accepted on Feb. 16, 2010) [abstract] [pdf]

  29. Ma, X., T. Yoshikane, M. Hara, Y. Wakazuki, H. G. Takahashi, and F. Kimura, 2010: Hydrological response to future climate change in the Agano River basin, Japan. Hydrol. Res. Lett., 4, 25-29, doi:10.3178/hrl.4.25. (Accepted on Mar. 03, 2010) [abstract] [pdf]

  30. Takahashi, H.G., T. Yoshikane, M. Hara, K. Takata, and T. Yasunari, 2010: High-resolution modelling of the potential impact of land-surface conditions on regional climate over Indochina associated with the diurnal precipitation cycle. Int. J. Climatol., 30(13), 2004-2020, doi:10.1002/joc.2119. (Accepted on Jan. 05, 2010) [abstract] [PDF]

  31. Takahashi, H.G., H. Fujinami, T. Yasunari and J. Matsumoto, 2010: Diurnal rainfall pattern observed by TRMM-PR around the Indochina Peninsula. J. Geophys. Res., 115, D07109, doi:10.1029/2009JD012155. (Accepted on Nov. 10, 2009) [abstract] [PDF] American Geophysical Union (AGU)

  32. Oouchi, K., A. T. Noda, M. Satoh, B. Wang, S.-P. Xie, H.G. Takahashi, and T. Yasunari, 2009: Asian summer monsoon simulated by a global cloud-system-resolving model: Diurnal to intra-seasonal variability. Geophys. Res. Lett.,36, L11815, doi:10.1029/2009GL038271. [abstract] [pdf]

  33. Hara, M., T. Yoshikane, H.G. Takahashi, F. Kimura, A. Noda, and T. Tokioka, 2009: Assessment of the Diurnal Cycle of Precipitation over the Maritime Continent Simulated by 20-km Mesh GCM using TRMM PR Data. J. Meteor. Soc. Japan Ser. II, 87A, 413-424, doi:10.2151/jmsj.87A.413. [abstract] [pdf]

  34. Takahashi, H.G., T. Yoshikane, M. Hara and T. Yasunari, 2009: High-resolution regional climate simulations of the long-term decrease in September rainfall over Indochina, Atmos. Sci. Lett., 10, 14-18, doi:10.1002/asl.203. [abstract] [PDF] Royal Meteorological Society

  35. Takahashi, H.G., and T. Yasunari, 2008: Decreasing trend in rainfall over Indochina during the late summer monsoon: Impact of tropical cyclones. J. Meteor. Soc. Japan, 86, 429-438, doi:10.2151/jmsj.86.429. [abstract] [pdf]

  36. Takahashi, H.G., and T. Yasunari, 2006: A climatological monsoon break in rainfall over Indochina -A singularity in the seasonal march of the Asian summer monsoon-. J. Climate, 19, 1545-1556, doi:10.1175/JCLI3724.1. [abstract] [pdf] American Meteorological Society

  37. Kumagai, T., T. Saitoh, Y. Sato, H. Takahashi, O.J. Manfroi, T. Morooka, K. Kuraji, M. Suzuki, T. Yasunari and H. Komatsu, 2005: Annual water balance and seasonality of evapotranspiration in a Bornean tropical rainforest. Agr. Forest. Meteorol., 128, 81-92, doi:http://dx.doi.org/10.1016/j.agrformet.2004.08.006. [abstract, pdf]


Journal of Climate

Article: pp. 1545–1556

A Climatological Monsoon Break in Rainfall over Indochina—A Singularity in the Seasonal March of the Asian Summer Monsoon

Hiroshi G. Takahashi

Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan

Tetsuzo Yasunari

Hydrospheric Atmospheric Research Center, Nagoya University, Nagoya, Japan

(Manuscript received 21 February 2005, in final form 20 October 2005)

DOI: 10.1175/JCLI3724.1

ABSTRACT

This study investigated the climatological pentad mean annual cycle of rainfall in Thailand and the associated atmospheric circulation fields. The data used included two different data of rainfall: rain gauge data for Thailand from the Thai Meteorological Department and satellite-derived rainfall data from the Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP).

Climatological mean pentad values of rainfall taken over 50 yr clearly show a distinct climatological monsoon break (CMB) occurring over Thailand in late June. The occurrence of the CMB coincides with a drastic change of large-scale monsoon circulation in the seasonal march. The CMB is a significant singularity in the seasonal march of the Southeast Asia monsoon, which divides the rainy season into the early monsoon and the later monsoon over the Indochina Peninsula.

A quasi-stationary ridge dynamically induced by the north–south-oriented mountain range in Indochina is likely to cause the CMB. The formation of the strong ridge over the mountain ranges of Indochina is preceded by a sudden enhancement (northward expansion) of the upstream monsoon westerlies along a latitudinal band between 15° and 20°N in late June. The CMB also has an impact downstream. The orographically induced stationary Rossby waves enhance the cyclonic circulation to the lee of Indochina, and over the South China Sea. The enhancement of cyclonic circulation may be responsible for the summer monsoon rains peaking in late June over the South China Sea and the western North Pacific, and in the baiu front.


Journal of the Meteorological Society of Japan
Vol. 86 (2008) , No. 3 pp.429-438


Decreasing Trend in Rainfall over Indochina during the Late Summer Monsoon: Impact of Tropical Cyclones


Hiroshi G. TAKAHASHI1) and Tetsuzo YASUNARI1)2)

1) Frontier Research Center for Global Change (FRCGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama

2) Hydrospheric Atmospheric Research Center (HyARC), Nagoya University

(Received May 14, 2007)
(Accepted January 28, 2008)

Abstract

We examined the decreasing trend in rainfall during the late summer monsoon season (September) in Thailand from 1951 to 2000 and associated changes in tropical cyclone (TC) activity. Thailand receives significant rainfall from May to October and experiences two rainy peaks in late May to early June and in September. A previous study reported a decreasing trend in September rainfall in Thailand and, based on a regional climate model, suggested that the trend was associated with local deforestation. However, the long-term trend may also be affected by changes in large-scale circulation. Thus, the purpose of this study was to investigate changes in large-scale circulation associated with the decreasing rainfall trend.
Westward-propagating TCs from the South China Sea and the western North Pacific brought most of the rainfall over Thailand in September. TCs include tropical depressions, tropical storms, severe tropical storms, typhoons, and residual lows. 70% of the rainfall amount in September was estimated to be associated with TCs.
The 50-year time-series of September rainfall over Thailand showed a significant decreasing trend. TC activity defined by 700-hPa relative vorticity, showed a weakening trend over the Indochina Peninsula. TC tracks also suggested the weakening of TC activity over this area. The long-term trend in rainfall during the late summer monsoon season was closely associated with changes in TC activity over the Indochina Peninsula; these changes were likely caused by changes in the major course of TCs. Concurrent with the changes in TC tracks, there was a change in the TC steering current around the Philippines archipelago and Taiwan. This led to the TC activity over the Indochina Peninsula being inactive, probably resulting in the long-term decrease in rainfall over Thailand.


Atmospheric Science Letters, DOI: 10.1002/asl.203. Royal Meteorological Society

High-resolution regional climate simulations of the long-term decrease in September rainfall over Indochina

Hiroshi G. Takahashi 1 *, Takao Yoshikane 1, Masayuki Hara 1, Tetsuzo Yasunari 1 2

1Frontier Research Center for Global Change (FRCGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan

2Hydrospheric Atmospheric Research Center (HyARC), Nagoya University, Nagoya, Japan

*Correspondence to Hiroshi G. Takahashi, 3173-25 Showamachi, Kanazawa-ku, Yokohama City, Kanagawa 236-0001, Japan.

Funded by:
 Global Environment Research Fund (B-061) of the Ministry of the Environment, Japan.

Keywords
regional climate change • rainfall • tropical cyclone • deforestation • regional climate model

Abstract
We address the long-term decrease in September rainfall over the Indochina Peninsula. Distinct long-term decreases in rainfall along the monsoon trough across the Indochina Peninsula have been observed. We performed long-term simulations and discuss the effects of long-term changes in both the local surface conditions and large-scale circulation. Using a 30-year simulation for September for the period from 1966 to 1995 with land-use conditions fixed at present-day values and neglecting the recorded deforestation, we successfully simulated the observed long-term decrease in rainfall. We therefore conclude that the weakening tropical-cyclone activity over the Indochina Peninsula region is probably responsible for the decrease in rainfall. Copyright © 2008 Royal Meteorological Society

Received: 26 June 2008; Revised: 3 September 2008; Accepted: 30 October 2008

10.1002/asl.203

Diurnal rainfall pattern observed by TRMM-PR around the Indochina Peninsula
H. G. Takahashi,1 H. Fujinami,2 T. Yasunari,1,2 and J. Matsumoto3,4

Abstract.
  This study addressed the diurnal cycle of rainfall during the summer monsoon season (May to September) around the Indochina Peninsula, with a focus on the diurnal cycle’s relationship to terrain. The investigation used 10-year (1998–2007) Tropical Rainfall Measuring Mission Precipitation Radar (TRMM-PR) observations.
  Results revealed that the diurnal variations in rainfall over the Indochina region had three distinct peaks. An early afternoon maximum of rainfall occurred along the mountain ranges and on coastal land. Evening rainfall was observed near the foot of mountain ranges, in a valley, and in a basin-shaped plain; this rainfall weakened before the middle of the night. Heavy rainfall in the early morning was found around the coasts over the eastern Gulf of Thailand and the Bay of Bengal, as well as over the eastern Khorat Plateau. We found that nearly half of the total rainfall occurred in the early morning over these regions, which indicated that early morning rainfall significantly contributes to the climatological rainfall pattern. Note that the regions with early morning heavy rain did not correspond to windward faces of mountains, but to the windward plain or to an offshore area apart from the mountain ranges in the windward direction. Additional examination of rainfall frequency and rainfall intensity showed that this early morning heavy rainfall was composed of frequent or long-lasting rainfall events with a strong intensity.

Journal of Geophysical Research -Atmosphere


High-resolution modelling of the potential impact of land-surface conditions
on regional climate over Indochina associated with the diurnal precipitation cycle


Hiroshi G. Takahashi(1)*, Takao Yoshikane(1), Masayuki Hara(1), Kumiko Takata(1)
and Tetsuzo Yasunari(2)

Abstract
    This study examined the impact of changes in land-surface conditions on regional climate over Indochina using a high-resolution regional climate model. Anthropogenically-induced land-surface changes are ongoing in this part of tropical Southeast Asia. Because a previous study suggested that deforestation in this area affected September precipitation, we chose September as the study period. We performed a control simulation (CTL) driven by reanalysis data combined with current land use and predicted soil-moisture data. The CTL reproduced the spatial distribution of total
precipitation well. In addition, it also simulated a distinct diurnal cycle of precipitation that was previously reported in observational studies. Two sensitivity experiments, assuming wetter and drier land-surface conditions over the Khorat Plateau (northeast Thailand) compared with the current land-surface condition, were conducted and examined the impact of land-surface changes on precipitation. The results indicated that drier land-surface conditions increased precipitation over the disturbed region. A pronounced increase in precipitation was found only during nighttime, which coincided with the peak in the climatological diurnal precipitation cycle. Climatologically, the diurnal peak in precipitation occurs from evening to early morning over the Khorat Plateau.
    Drier conditions intensified the diurnal variation of precipitable water associated with the thermally-induced local circulation responsible for a horizontal gradient of near-surface temperature. The effects of land-use and land-cover changes in the tropics are shown to be strongly related to the diurnal precipitation cycle.

International Journal of Climatology, in press.