Satellite Assessment of Divergent Water Vapor Transport from NCEP, ERA40, and JRA25 Reanalyses over the Asian Summer Monsoon Region

2007 ◽  
Vol 85 (5) ◽  
pp. 615-632 ◽  
Author(s):  
Seong-Chan PARK ◽  
Byung-Ju SOHN ◽  
Bin WANG
Keyword(s):  
Water Vapor ◽  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Vapor Transport ◽  
Water Vapor Transport ◽  
Monsoon Region ◽  
Asian Summer ◽  
Summer Monsoon Region

scholarly journals Role and Mechanisms of Black Carbon Affecting Water Vapor Transport to Tibet

2020 ◽  
Vol 12 (2) ◽  
pp. 231 ◽  
Author(s):  
Min Luo ◽  
Yuzhi Liu ◽  
Qingzhe Zhu ◽  
Yuhan Tang ◽  
Khan Alam
Keyword(s):  
Water Vapor ◽  
Black Carbon ◽  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Vapor Transport ◽  
Water Vapor Transport ◽  
The South ◽  
Asian Summer ◽  
Cooling Effects ◽  
The Impact

Although some studies reported the impact of black carbon (BC) on the climate over the Tibetan Plateau (TP), the contribution and mechanisms of BC affecting the water vapor transport to Tibet are not fully understood yet. Here, utilizing the satellite observations and reanalysis data, the effects of BC on the climate over the TP and water vapor transport to the Tibet were investigated by the Community Earth System Model (CESM 2.1.0). Due to the addition of BC, a positive net heat forcing (average is 0.39 W/m2) is exerted at the surface, which induces a pronounced warming effect over the TP and consequently intensifies the East Asian Summer monsoon (EASM). However, significant cooling effects in northern India, Pakistan, Afghanistan and Iran are induced due to the BC and related feedbacks, which reduces significantly the meridional land–sea thermal contrast and finally weakens the South Asian summer monsoon (SASM). Consequently, the water vapor transport to the south border is decreased due to addition of BC. Moreover, through affecting the atmospheric circulation, the BC could induce an increase in the imported water vapor from the west and east borders of the TP, and an increase outflowing away from the north border of the TP. Overall, due to the BC, the annual mean net importing water vapor over TP is around 271 Gt, which could enhance the precipitation over the TP. The results show that the mean increase in the precipitation over TP is about 0.56 mm/day.

Application of GSMaP for the analysis of upper tropospheric radiative cooling over the Asian summer monsoon region

2021 ◽  
Author(s):  
Toru Terao ◽  
Fumie Murata ◽  
Yusuke Yamane ◽  
Masashi Kiguchi ◽  
Azusa Fukushima ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Potential Temperature ◽  
High Potential ◽  
Monsoon Circulation ◽  
Monsoon Region ◽  
Air Mass ◽  
Monsoon System ◽  
Asian Summer ◽  
Summer Monsoon Region

<p>The Asian summer monsoon system is the strongest monsoon circulation on the Earth. A huge reversal of meridional temperature gradient develops over the area covering the hemispheric region due to strong diabatic heating associated with convective activities. Vigorous conventions reach the upper troposphere providing a great amount of high potential temperature airmass. This high potential temperature air mass originates from the high equivalent potential temperature airmass accumulated in the lower troposphere over the Asian monsoon region. The highest potential temperature tropospheric air mass is observed only over the Asian summer monsoon region. To get a total view of the Asian summer monsoon circulation system, we focused on the mass budget of the upper-tropospheric air mass with a potential temperature between 355K to 370K. The non-conservative change of the air mass corresponds with the diabatic heating due to the convective activities, and the diabatic cooling due to the radiative process. To analyze the radiative cooling process that takes place in the upper troposphere, we utilized hourly GSMaP pixel values to detect rain-free pixels of the ERA5 dataset. We calculated the non-conservative air mass tendency over the rain-free pixels on a daily and 0.5 degrees spatio-temporal scale. We found the radiative equilibrium amount of high potential temperature air mass and the Newtonian cooling process with a relaxation time scale of 6 to 7 days. We will show the quantitative estimates of the total convective process of the Asian summer monsoon system associated with the convective clouds and radiative processes, through the mass budget of 355K-370K potential temperature air mass. We will further show results of the evaluation of the accuracy of TRMM and GPM products using our high-resolution tipping bucket raingauge network distributed over the Northeastern Indian subcontinent.</p>

scholarly journals Association of the pre-monsoon thermal field over north India and the western Tibetan Plateau with summer monsoon rainfall over India

2015 ◽  
Vol 33 (8) ◽  
pp. 1051-1058 ◽  
Author(s):  
S. D. Bansod ◽  
S. Fadnavis ◽  
S. P. Ghanekar
Keyword(s):  
Tibetan Plateau ◽  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Summer Monsoon Rainfall ◽  
North India ◽  
Monsoon Region ◽  
The North ◽  
Western Tibetan Plateau ◽  
Asian Summer ◽  
Summer Monsoon Region

Abstract. In this paper, interannual variability of tropospheric air temperatures over the Asian summer monsoon region during the pre-monsoon months is examined in relation to Indian summer monsoon rainfall (ISMR; June to September total rainfall). For this purpose, monthly grid-point temperatures in the entire troposphere over the Asian summer monsoon region and ISMR data for the period 1949–2012 have been used. Spatial correlation patterns are investigated between the temperature field in the lower tropospheric levels during May over the Asian summer monsoon region and ISMR. The results indicate a strong and significant northwest–southeast dipole structure in the spatial correlations over the Indian region, with highly significant positive (negative) correlations over the regions of north India and the western Tibetan Plateau region – region R1 (north Bay of Bengal: region R2). The observed dipole is seen significantly up to a level of 850 hPa and eventually disappears at 700 hPa. Thermal indices evaluated at 850 hPa level, based on average air temperatures over the north India and western Tibetan Plateau region (TI1) and the north Bay of Bengal region (TI2) during May, show a strong, significant relationship with the ISMR. The results are found to be consistent and robust, especially in the case of TI1 during the period of analysis. A physical mechanism for the relationship between these indices and ISMR is proposed. Finally the composite annual cycle of tropospheric air temperature over R1 during flood/drought years of ISMR is examined. The study brings out the importance of the TI1 in the prediction of flood/drought conditions over the Indian subcontinent.

Drought variability at the northern fringe of the Asian summer monsoon region over the past millennia

2013 ◽  
Vol 43 (3-4) ◽  
pp. 845-859 ◽  
Author(s):  
Bao Yang ◽  
Shuyuan Kang ◽  
Fredrik Charpentier Ljungqvist ◽  
Minhui He ◽  
Yan Zhao ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Monsoon Region ◽  
Drought Variability ◽  
The Past ◽  
Asian Summer ◽  
Northern Fringe ◽  
Summer Monsoon Region

New real-time indices for the quasi-biweekly oscillation over the Asian summer monsoon region

2019 ◽  
Vol 53 (5-6) ◽  
pp. 2603-2624 ◽  
Author(s):  
Yitian Qian ◽  
Pang-Chi Hsu ◽  
Kikuchi Kazuyoshi
Keyword(s):  
Real Time ◽  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Monsoon Region ◽  
Asian Summer ◽  
Summer Monsoon Region
Sign in / Sign up

Export Citation Format

Share Document