The influence of tropical ocean on the South Asia High and the Western Pacifica Subtropical High

doi:10.12006/j.issn.1673-1719.2017.069

Abstract

Abstract:

The influence on both South Asia High (SAH) and the Western Pacifica Subtropical High (WPSH) during summertime is investigated in this paper with a development of a tropical sea surface temperature (SST), based on the NCEP/NCAR reanalysis data from 1951 to 2010. Some reasons for both development of those two systems have been researched: When the systems are both strong and the SST is warm (the systems are week and the SST is cold), in the winter and spring season the equatorial Indian?Pacific SST anomaly shows a significant positive?negative?positive (negative?positive?negative) pattern, which is like the El Ni?o (La Ni?a) phenomenon. A high-level westerly (easterly) wind flows near Indochina troposphere, which is helpful (against) for anomalous anticyclonic circulation in the south, so as to promote (block) the development of SAH. The sinking (rising) flow in Philippine area is conducive (unfavorable) to the anomalous anticyclonic circulation in the northwest side, so as to promote (block) the development of lower WPSH. In summertime, warming of the tropical Indian Ocean SST increase (decrease) the local convection effect effectively, making the tropospheric temperature rising (reducing), which affects SAH and WPSH.

Key words: South Asia High, Western Pacific Subtropical High (WPSH), Atmospheric circulation, SST

Wan FENG, Guang-Zhou FAN, Yan-Yan LONG. The influence of tropical ocean on the South Asia High and the Western Pacifica Subtropical High[J]. Climate Change Research, 2018, 14(2): 111-119.

Figures/Tables 9

Fig. 1 Monthly lead-lag correlation of the SAH (a), WPSH (b) intensity with Ni?o3.4 index and IOBMI index during 1951-2010

Table 1 A combination of summer high intensity and the former winter SST in Ni?o3.4

Fig. 2 The global sea surface temperature anomaly synthesis for a strong summer SAH and WPSH both in warm SST and cold SST pattern

Fig. 3 The wind anomaly synthesis for a strong summer SAH and WPSH and warm SST at 200 hPa and 850 hPa

Fig. 4 The global sea surface temperature anomaly synthesis for a weak summer SAH and WPSH both in cold SST and warm SST pattern

Fig. 5 The wind anomaly synthesis for a weak summer SAH and WPSH and cold SST at 200 hPa and 850 hPa

Fig. 6 The zonal circulation along the height in 10°S-0°of the strong high and warm SST (a), weak high and cold SST (b) in winter (the vertical velocity expanded by 100 times)

Fig. 7 The zonal circulation along the height in 0°-10°N of the strong high and warm SST (a), weak high and cold SST (b) in spring (the vertical velocity expanded by 100 times)

Fig. 8 The correlation coefficients of IOBMI in summer and 850-100 hPa tropospheric temperature (contour) and wind field (vector diagram)

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