Cloudiness variations over the Qinghai-Tibet Plateau during 1971–2004

Zhang, Xueqin; Peng, Li-Li; Du, Zheng; Tao, Jie

doi:10.1007/s11442-008-0142-1

Cited by 25 publications

(38 citation statements)

References 26 publications

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“…It's clearly seen that negative high value of CRF mainly distributes in the southeast Tibetan Plateau (Szechwan Basin and Guizhou), Hunan, Jiangxi and southeast coast; beyond north of 40 degree the CRF values are generally small; strong cloud forcing with negative high CRF value presents in cloudy area in Bangladesh over southeast Tibetan Plateau, while weak cloud forcing with negative low CRF value appears on the Qaidam Basin over the north plateau. These regional characteristics of CRF are highly consistent with the distribution of total cloud amount in China and Tibetan Plateau [12].…”

Section: A the Spatial Distribution Of Interannual Crfsupporting

confidence: 75%

Shortwave radiative forcing of clouds and aerosols over China from 1998 to 2002

Liu

2010

2010 18th International Conference on Geoinformatics

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Radiative forcing of clouds and aerosols are of research highlight in climate change science. In this paper, the shortwave radiative forcing of clouds and aerosols were estimated from Geostationary Meteorological Satellite (GMS) 5 data over China from 1998 to 2002, respectively. Such estimation is performed by a newly retrieval strategy based on radiative transfer model, which calculates shortwave cloud radiative forcing as the difference between downward solar radiation under all-sky and clear-sky, and shortwave aerosol direct radiative forcing as the difference between downward solar radiation under cloud-free sky with and without aerosol. Both instantaneous radiative forcing of cloud and aerosol were integrated to their daily mean radiative forcing, and then their annual spatial distribution can be derived. Based on them, this paper demonstrates changing patterns and processes of cloud and aerosol shortwave radiative forcing over China during those 5 years, analyses the role of cloud and aerosol that plays within each duration when downward solar radiation at surface changes. The analysis of overall radiative forcing of clouds and aerosols suggests that aerosol shortwave radiative forcing has increased by 32.8% (7.27W m -2 ) and cloud shortwave radiative forcing has decreased by 7% (4.81W m -2 ) for those 5 years. The impact of variability of aerosol shortwave radiative forcing has exceeded that of cloud shortwave radiative forcing, which led to the overall shortwave radiative forcing increased, thereby further decreased the downward solar radiation over China.

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Section: A the Spatial Distribution Of Interannual Crfsupporting

confidence: 75%

Shortwave radiative forcing of clouds and aerosols over China from 1998 to 2002

Liu

2010

2010 18th International Conference on Geoinformatics

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“…During 1971–2004, the annual mean total cloud cover on the TP ranges from over than 64% in the southeast to less than 44% in the northern and southwestern parts [ Zhang et al , ]. A significant decreasing trend in total cloud cover has been observed on the TP since the 1950s [ Kaiser , ; Niu et al , ; Duan and Wu , ; Zhang et al , ; You et al , ; Yang et al , ; Yang et al , ; You et al , ; You et al , ]. The total cloud cover over the TP shows a decreasing trend of −0.49% decade −1 during 1961–2013 [ You et al , ], which is shown in Figure a.…”

Section: Changes In Other Climate Variablesmentioning

confidence: 99%

“…Most stations on the TP show decreasing trends in total cloud cover [ Kaiser , ; Niu et al , ; Zhang et al , ; You et al , ]. About 65% of the stations show significant decreasing trends with the most significant decrease in the central TP [ You et al , ].…”

Section: Changes In Other Climate Variablesmentioning

confidence: 99%

“…About 65% of the stations show significant decreasing trends with the most significant decrease in the central TP [ You et al , ]. The decline in total cloud cover has been found to occur in all seasons [ Zhang et al , ; You et al , ]. The decreasing trends in summer and winter during 1961–2013 are −0.34 and −0.27% decade −1 , respectively [ You et al , ].…”

Section: Changes In Other Climate Variablesmentioning

confidence: 99%

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Review on climate change on the Tibetan Plateau during the last half century

2016

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The Tibetan Plateau (TP) is undergoing significant warming since the 1950s. During the past two decades, extensive research has been conducted to investigate the climate change on the plateau. This review presents an overview of recent progress on climate change on the TP with the aim of providing a comprehensive understanding of changes in climate variables. Long‐term observation data from meteorological stations presented by the published literature were used to show the trends in various climate variables. The TP is overall getting warmer and wetter during the past decades. Temperature is significantly increased, especially since the 1980s. The overall warming rate ranges from 0.16 to 0.67°C decade−1 since the 1950s during different periods. The TP shows a uniform warming trend with the most significant warming in the northern part. Precipitation is slightly increased, and the spatial pattern of changes in precipitation is variable. The annual precipitation is increasing in most areas of the TP. Some subregions are becoming wetter, while some subregions are becoming drier. Pan evaporation, reference evapotranspiration, and potential evapotranspiration have been found to decrease since the 1960s. Actual evapotranspiration is significantly increased since the 1960s. Wind speed and sunshine duration increased up to the 1970s and then decreased significantly afterwards. Relative humidity fluctuated up and down to the end of the 1990s and appeared to decrease afterwards. Vapor pressure deficit shows an overall increasing trend since the 1970s. Causes of changes in the climate variables are presented, and future research directions are recommended.

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“…These trends in dimming and brightening have been attributed to atmospheric aerosols but for the Tibetan Plateau region the observations are much more limited and our understanding of these trends and their causes less clear. Duan and Wu (2006) reported changes in cloud amount over the Tibetan Plateau [also identified by Zhang et al (2008) and Yang et al (2012)] and suggested that these changes (i.e., daytime decrease, nighttime increase) played a role in the temperature increase in the region, through their radiative impact. Ye et al (2009), for example, found a strong correlation between surface downward shortwave fluxes and the diurnal temperature range.…”

Section: Introductionmentioning

confidence: 95%

A Satellite View of the Radiative Impact of Clouds on Surface Downward Fluxes in the Tibetan Plateau

Naud

Rangwala

et al. 2015

Journal of Applied Meteorology and Climatology

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Using 13 yr of satellite observations for the Tibetan Plateau, the sensitivities (or partial derivatives) of daytime surface downward shortwave and longwave fluxes with respect to changes in cloud cover and cloud optical thickness are investigated and quantified. Coincident cloud and surface flux retrievals from the NASA Moderate Resolution Imaging Spectroradiometer and the Clouds and the Earth's Radiant Energy System, respectively, as well as ground-based observations at 11 stations across the plateau are used to examine the spatial and seasonal variability of this sensitivity over the entire plateau. The downward shortwave flux is found to be modulated primarily by changes in cloud cover, but changes in optical thickness also have an impact, as revealed by a multiple regression fit. The coefficient of determination of the regression increases by more than 15% when optical thickness is added. There is significant seasonal and regional variability in the cloud radiative impact. On average, at all stations, the sensitivity of surface shortwave flux to changes in cloud cover is about 20.5 6 0.1 W m 22 % 21 in winter according to both ground-based and satellite observations but in summer reaches 21.5 6 0.3 and 21.8 6 0.2 W m 22 % 21 according to ground-based and satellite observations, respectively. Cloud cover itself has little impact on the sensitivity when clouds are optically thin, but above an optical thickness of 12, sensitivities increase with both cloud cover and cloud optical thickness. The daytime longwave flux response to changes in cloud properties is also examined. The radiative impact of a decrease in cloud cover on the surface net flux can be offset or even canceled if cloud opacity increases by 5%-10%.

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Cloudiness variations over the Qinghai-Tibet Plateau during 1971–2004

Cited by 25 publications

References 26 publications

Shortwave radiative forcing of clouds and aerosols over China from 1998 to 2002

Shortwave radiative forcing of clouds and aerosols over China from 1998 to 2002

Review on climate change on the Tibetan Plateau during the last half century

A Satellite View of the Radiative Impact of Clouds on Surface Downward Fluxes in the Tibetan Plateau

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