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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

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2018 Impact Factor: 1.205

Front. Earth Sci.    2021, Vol. 15 Issue (1) : 151-166    https://doi.org/10.1007/s11707-020-0846-9
RESEARCH ARTICLE
Relationship between the Tibetan Plateau–tropical Indian Ocean thermal contrast and the South Asian summer monsoon
Xiaoqing LUO1,2, Jianjun XU1,2(), Yu ZHANG1,2, Kai LI3
1. South China Sea Institute of Marine Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
2. College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
3. Maritime College, Guangdong Ocean University, Zhanjiang 524088, China
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Abstract

The impact of land–sea thermal contrast on the South Asian summer monsoon (SASM) was investigated by calculating the atmospheric heat sources (AHS) and baroclinic component with ERA5 data for the period 1979–2019. Using diagnostic and statistical methods, it was found that the thermal contrast between the Tibetan Plateau (TP) and the tropical Indian Ocean (TIO) affects the South Asian monsoon circulation through the meridional temperature gradient in the upper troposphere. The seasonal changes of the AHS of the TP and TIO are reversed. In summer, the TP is the strongest at the same latitude whereas the TIO is the weakest, and the thermal contrast is the most obvious. The heat sources of the TP and TIO are located on the north and south side of the strong baroclinic area of the SASM region, respectively, and both of which are dominated by deep convective heating in the upper troposphere. The TP–TIO regional meridional thermal contrast index (QI) based on the AHS, and the SASM index (MI) based on baroclinicity were found to be strongly positively correlated. In years of abnormally high QI, the thermal contrast between the TP and TIO is strong in summer, which warms the upper troposphere over Eurasia and cools it over the TIO. The stronger temperature gradient enhances the baroclinicity in the troposphere, which results in a strengthening of the low-level westerly airflow and the upper-level easterly airflow. The anomalous winds strengthen the South Asian high (SAH), with the warmer center in the upper troposphere, and the enhanced Walker circulation over the equatorial Indian Ocean. Finally, the anomalous circulation leads to much more precipitation over the SASM region. The influence of abnormally low QI is almost the opposite.

Keywords Tibetan Plateau      tropical Indian Ocean      atmosphere heat sources      South Asian summer monsoon      atmosphere baroclinic component     
Corresponding Author(s): Jianjun XU   
Online First Date: 19 March 2021    Issue Date: 19 April 2021
 Cite this article:   
Xiaoqing LUO,Jianjun XU,Yu ZHANG, et al. Relationship between the Tibetan Plateau–tropical Indian Ocean thermal contrast and the South Asian summer monsoon[J]. Front. Earth Sci., 2021, 15(1): 151-166.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-020-0846-9
https://academic.hep.com.cn/fesci/EN/Y2021/V15/I1/151
Fig.1  Study area, showing the topography (shaded; unit: m) of the Tibetan Plateau (TP; 75°E–103°E, 28°N–38°N; altitude≥3000 m; bordered in red), the tropical Indian Ocean (TIO; 60°E–100°E, 15°S–5°N; red box) and the South Asian monsoon region (SAM, 40°E–100°E, 0°–20°N; black box).
Fig.2  Seasonal variations of the zonal anomaly of Q1 (shaded; units: W/m2) and Ks≥60 m/s (black curve). MAM (March–April–May), JJA (June–July–August), SON (September–October–November) and DJF (December–January–February) represent spring, summer, autumn and winter, respectively. The Tibetan Plateau (≥3000 m) is outlined in green; the tropical Indian Ocean is indicated by the green box.
Fig.3  Zonal mean of (a) Q1 and (b) Q2 (units: W/m2). The Tibetan Plateau (TP≥3000 m) is located at 28°N–38°N; the tropical Indian Ocean (TIO) is located at 15S°–5°N; MAM (March–April–May), JJA (June–July–August), SON September–October–November) and DJF (December–January–February) represent spring, summer, autumn and winter, respectively; and altitude is shaded black (unit: km).
Fig.4  Vertical profiles of summer Q1 and Q2 at 90°E. The Tibetan Plateau is represented by the dotted curve at 28°N–38°N, and the TIO by the solid curve at 15°S–5°N; Q1 t, Q1 v and Q1 w represent the time tendency, horizontal advection and vertical advection, respectively, and likewise for Q2.
Fig.5  The 400–200-hPa time–meridional variations of (a) Q2, (b) Q2t, (c) Q2w and (d) temperature at 70°E–100°E(Q2t, and Q2w represent the time tendency and vertical advection, respectively).
Fig.6  Zonal temperature anomaly at 400–200 hPa (red curve, unit: K), 200-hPa geopotential≥12500 gpm (black curve), and outgoing longwave radiation (shaded; units: W/m2) in summer. The Tibetan Plateau (≥3000 m) is outlined in green; the tropical Indian Ocean is indicated by the green box.
Fig.7  Seasonal variations of QI(solid black line), QIup (black dotted line), TIup (purple line) and MI (red line) (see subsection 2.2(2) in the main text for definitions of these indexes). The Q1 in the TP and TIO is denoted in orange and blue, respectively, and all data have been detrended and standardized.
Fig.8  Evaluation of the SASM, in which (a–f) represent May–October, respectively, with precipitation shaded (units: mm/day). The wind vectors are at 850 hPa (units: m/s); the Ks≥60 m/s is outlined in red; the Tibetan Plateau is outlined in blue (altitude≥3000 m); and the tropical Indian Ocean is denoted by the blue box.
Fig.9  Seasonal–zonal profiles at 15°N of (a) zonal wind at 850 hPa, (b) meridional wind at 200 hPa, (c) Q1, and (d) precipitation. Shading in (a, c) represents values≥0; in (b) it represents v≤0; and in (d) Pre≥0.
Fig.10  Temporal variations of the summer QI, TIup, QIup and MI (see section 2.2. (2) for definitions of these indexes; all data have been detrended and standardized).
Fig.11  Anomalous temperature at 400–200 hPa (shaded; unit: K; dotted areas pass the 90% significance test) and Ks (≥60 m/s). Pos represents QI≥1; Neg represents QI<1. The Tibetan Plateau (≥3000 m) is outlined in green; the tropical Indian Ocean is denoted by the green box.
Fig.12  Seasonal profiles of the difference in anomalous temperature at 400–200 hPa between 30°N and 5°N. Pos represents QI≥1; Neg represents QI<1; shaded area represents temperature≥6 K.
Fig.13  Vertical–meridional profiles of the anomalous Q1 (shaded) and Ks (curve) in summer. The mean is at 80°E–96°E; Pos represents QI≥1; Neg represents QI<1; and black shading and blue dotted line represent the topography and TP respectively).
Ks u Ks v
Nor Pos Neg Nor Pos Neg
Jun 66.40 70.53 66.40 19.98 21.23 19.15
Jul 80.10 80.84 80.10 22.19 22.37 21.17
Aug 74.74 78.00 74.74 19.98 21.11 19.44
mean 73.75 76.45 73.75 20.71 21.57 19.92
Tab.1  The anomalies of Ksu and Ksv in summer. Pos represents QI≥1; Neg represents QI<1; Nor represents the normal
QI
+ 3 + 2 + 1 0
MI 0.158 0.412 0.642 0.729
TIup 0.327 0.659 0.841 0.796
Tab.2  Correlation coefficients between the thermal contrast index and MI.
Fig.14  Regression of TIup, Ks and T2m on QI in summer. Shaded areas pass the 95% significance test; the Tibetan Plateau (≥3000 m) is outlined in green; and the tropical Indian Ocean is denoted by the green box.
Fig.15  The 850-hPa u-component (a) and 200-hPa v-component in summer at 15°N (b). Pos represents QI≥1; Neg represents QI<1; Nor represents the norm; and shading indicates v≤0.
Fig.16  Abnormal winds at 850 hPa (a1, b1), 200 hPa in summer (a2, b2) and the Ks (red curve). Pos represents QI≥1; Neg represents QI<1; wind vectors pass the 95% significance test; the Tibetan Plateau (≥3000 m) is outlined in green; the tropical Indian Ocean is denoted by the green box; and blue box represent 90°E–110°E, 23°N–38°N.
Fig.17  Vertical–zonal profiles of anomalous uw winds (vectors) and the Q1 (shaded) in summer at 0°–20°N. Pos represents QI≥1; Neg represents QI<1; and black shading denotes the topography.
Fig.18  Difference in summer precipitation in the Asian monsoon region between positive and negative QI (units: mm/day; plus signs indicate areas passing the 95% significance test; and black line and red line (geopotential≥12500 gpm) represents the SAH area of QI≥1 and QI<1 respectively; and black line and red line (geopotential≥12553 gpm) represents the SAH center of QI≥1 and QI<1 respectively).
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