Diurnal Variation Characteristics of Summer Convection over the Qinghai-Xizang Plateau and South Asia Area based on the High-resolution OLR Data

Yingwen KANG;Yuanfa GONG

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Plateau Meteorology
Plateau Meteorology ›› 2021, Vol. 40 ›› Issue (3) : 472-485. DOI: 10.7522/j.issn.1000-0534.2020.00105

Diurnal Variation Characteristics of Summer Convection over the Qinghai-Xizang Plateau and South Asia Area based on the High-resolution OLR Data

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Abstract

Based on the high-resolution （the spatial resolution is 0.25°×0.25°， the temporal resolution is once every 3 hours， 8 times a day） outgoing longwave radiation （OLR） data of the geostationary meteorological satellite Kalpana-1 from 2004 to 2017， the characteristics of convection diurnal variations over the Qinghai-Xizang Plateau and South Asia area in summer are analyzed.Combined with ERA-Interim analysis data and the observed precipitation data in China， the relationship among convective activity anomaly， vertical velocity anomaly and precipitation anomaly in 2006 and 2007 is studied.The results show that： （1） In June to September of summer， especially from July to August， the severe convection mainly occurs in the central and southeastern Qinghai-Xizang Plateau， the northeastern Indian Peninsula， the Bay of Bengal and the Indochina Peninsula.Minimum value of mean OLR in the strongest convection area is less than 190 W·m-2.（2） The characteristics of convection diurnal variations over the Qinghai-Xizang Plateau and South Asia area are obvious.In the central-southern and the southeastern Qinghai-Xizang Plateau， the northeastern Indian Peninsula and the southern Indochina Peninsula， the strong convective areas with OLR below 210 W·m-2 begin to appear around 09:00 （UTC， the same as after）， the strongest convective activity takes place at 12:00， and the convective activity can continue until the next morning.However， in the East Coast of the Bay of Bengal， the obvious convective activity occurs throughout the day and reaches its twice maximum at 09:00 and 21:00.Compared with convection diurnal variations over the Qinghai-Xizang Plateau， South Asia area and the Bay of Bengal， the land areas have one cycle one day， the East Coast of the Bay of Bengal has two cycles one day， and the strongest diurnal oscillation occurs in the central-southern Qinghai-Xizang Plateau.（3） A comparative analysis of OLR， vertical velocity and precipitation anomaly over the Qinghai-Xizang Plateau and Southwest China from July to August in 2006 and 2007 shows that negative （positive） anomaly of the high-resolution OLR indicates that the abnormal strong （weak） convection is closely related to the abnormal ascending （sinking） movement and the abnormal more （less） precipitation， which can be used to characterize the variation characteristics of convective activity over the Qinghai-Xizang Plateau and make up for the lack of observational data.

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Qinghai-Xizang Plate / Outgoing Longwave Ra

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Yingwen KANG , Yuanfa GONG. Diurnal Variation Characteristics of Summer Convection over the Qinghai-Xizang Plateau and South Asia Area based on the High-resolution OLR Data. Plateau Meteorology. 2021, 40(3): 472-485 https://doi.org/10.7522/j.issn.1000-0534.2020.00105

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