Relations of Cloud Amount to Asymmetric Diurnal Temperature Change in Central and Eastern Qinghai-Xizang Plateau

  • WANG Yi ,
  • BO Yue ,
  • WANG Chenghai
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  • Key Laboratory for Arid Climatic Change and Disaster Reduction of Gansu Province, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China

Received date: 2014-11-27

  Online published: 2016-08-28

Abstract

By using ISCCP data and observation station data, the variations of cloud amount and cloud types are investigated in Central and Eastern Qinghai-Xizang Plateau (QXP) from 1984 to 2009; and the relationship between daily maximum/minimum temperature and cloud amount are analyzed. The results show that the diurnal variations of cloud amount at low-mid-level in QXP appears obviously unimodal types, but the diurnal variations of high-cloud amounts are not obviously. The warming rates of daily maximum/minimum temperature in TP are different, i.e, so called asymmetric diurnal temperature change. Diurnal/nocturnal cloud amount and daily maximum/minimum temperature have a distinct relation over Central and Eastern QXP, which have a positive feedback mechanism. The asymmetric temperature change reduces the difference of temperature between land and atmosphere in the morning, then the convection weakens, which may cause cloud amounts decreasing after sunrise. It will lead to much more solar shortwave radiation reaches the ground and the faster process of air warming in the morning. The decreasing of low-mid-cloud amounts and increasing of high-cloud amounts at noon increase the solar radiation of reaches the ground and causes a warmer daily maximum temperature. Cloud amounts of total cloud increase at dusk except cirrus, which slows down the decreasing rate of temperature after sunset, which benefits to increase the daily minimum temperature.

Cite this article

WANG Yi , BO Yue , WANG Chenghai . Relations of Cloud Amount to Asymmetric Diurnal Temperature Change in Central and Eastern Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2016 , 35(4) : 908 -919 . DOI: 10.7522/j.issn.1000-0534.2015.00033

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