Long-term variations in actual evapotranspiration over the Tibetan Plateau

Han, Cunbo; Ma, Yaoming; Wang, Binbin; Zhong, Lei; Ma, Wei; Chen, Xuelong; Su, Zhongbo

doi:10.5194/essd-13-3513-2021

Cited by 65 publications

(57 citation statements)

References 46 publications

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“…A clear zonal seesaw pattern could be observed over the TP. The same analysis based on the remote sensing product derived from Han et al [28,29] also indicated that the first leading mode of summer SH showed significant consistent variations, and the second leading mode of summer SH showed a zonal dipolar pattern (Figure S1).…”

Section: Dominant Modes Of Variation In Summer Sh Over the Tpmentioning

confidence: 61%

“…This indicated that positive SH anomalies in the western TP are usually accompanied by negative SH anomalies in the eastern TP on an interannual time scale. Based on meteorological data and satellite products, a recent study found that the long-term variations of summer evapotranspiration (ET) over the TP present a dipole pattern, with an increasing trend in the eastern TP and a decreasing trend in the western TP [29]. It is worth studying the cause of opposite spatial patterns between SH and ET over the TP.…”

Section: Discussionmentioning

confidence: 99%

“…A remote-sensing product derived from Han et al [28,29] was also used to analyze summer SH on the TP. A detailed retrieval algorithm of SH can be found in Han et al [28,29].…”

Section: Datamentioning

confidence: 99%

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Dominant Modes of Tibetan Plateau Summer Surface Sensible Heating and Associated Atmospheric Circulation Anomalies

Fan

et al. 2022

Remote Sensing

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Based on empirical orthogonal function (EOF) analysis, the dominant modes of variations in summer surface sensible heating (SH) over the Tibetan Plateau (TP), as well as the associated atmospheric circulation anomalies, were investigated in this study. The results show that the first dominant mode of summer SH presents a feature of decadal reduction over the whole TP on an interdecadal time scale, and the second dominant mode is characterized by a zonally asymmetric pattern with positive (negative) SH anomalies in the western (eastern) TP on an interannual time scale. The variations of summer SH are dominated by anomalies in downwelling surface shortwave radiation (DSWR), which are associated with atmospheric circulation changes. The first dominant mode of variation in SH is connected to the interdecadal variation of the Silk Road Pattern (SRP). Further analysis reveals that the interdecadal phase shift of the SRP induces anticyclone circulation to the northeast of the TP, leading to enhanced water vapor supply and convergence over the TP. This can lead to an increase in the total cloud cover, and a reduction in DSWR, contributing to the decadal reduction in SH over the TP. The second dominant mode of variation in SH is related to a stationary teleconnection pattern over the Eurasian continent named the North Atlantic-East and North Asia pattern (NAENA). Corresponding to the positive phase of the NAENA, there is a cyclone anomaly to the west TP, leading to anomalous water vapor convergence (divergence) over the eastern (western) TP. This can result in enhanced (decreased) cloud cover, reduced (increased) DSWR, and therefore, an anomalous decrease (enhancement) in SH over the east (west) of the TP. Furthermore, the southwesterly wind anomaly, which is accompanied by the anomalous cyclone to the west TP, leads to positive SH in the western TP.

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Section: Dominant Modes Of Variation In Summer Sh Over the Tpmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

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Dominant Modes of Tibetan Plateau Summer Surface Sensible Heating and Associated Atmospheric Circulation Anomalies

Fan

et al. 2022

Remote Sensing

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“…Despite many available global reanalysis datasets, most of them have been found to be substantially biased on the QTP due to the presence of complex mountainous terrains and unique atmospheric circulation patterns (A. Wang & Zeng, 2012; L. Zhang et al., 2020; Zhou et al., 2021). The recently developed gridded reanalysis dataset, that is, the China Meteorological Forcing Dataset (CMFD) (He et al., 2020), is one of those widely used for the QTP studies (Han et al., 2021; T. Wang et al., 2019). It was created by fusing site‐scale observations from the China Meteorological Administration with existing reanalysis data, such as Global Land Data Assimilation System (GLDAS), Tropical Rainfall Measuring Mission, and Global Energy and Water Exchanges‐Surface Radiation (He et al., 2020; K. Yang et al., 2010).…”

Section: Datasets and Methodsmentioning

confidence: 99%

On the Spin‐Up Strategy for Spatial Modeling of Permafrost Dynamics: A Case Study on the Qinghai‐Tibet Plateau

Zhang

et al. 2022

J Adv Model Earth Syst

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Spin‐up is essential to provide initial conditions for land surface models (LSM) when they cannot be given reliably as in the application to regional permafrost change studies. In this study, the impacts of spin‐up strategy including total spin‐up length and cycling scheme on modeling of permafrost dynamics on the Qinghai‐Tibet Plateau (QTP) were evaluated through two groups of experiments using a modified Noah LSM. The first group aims to test different total spin‐up lengths and the second group for different cycling schemes. The results show that the presence of permafrost prolongs the convergence of the model. Vertically, the slowest convergence is observed at the permafrost table. The insufficiency of total spin‐up length is prone to underestimate permafrost area and overestimate the degradation rate. Different cycling schemes considerably affect the resulting initial thermal fields and result in degradation rates with a difference of 3.37 × 103 km2/a on the QTP, which exceeds the difference (2.92 × 103 km2/a) in the degradation rates reported in existing studies. The multi‐year cycling scheme is generally preferred, but overlong cycle length should be avoided to prevent the introduction of climate change trends in the spin‐up period. We recommend a spin‐up strategy of a 500‐year cycling with the first 5‐ to 10‐year of forcing for modeling permafrost on the QTP with the Noah LSM. Our findings highlight the importance of the spin‐up strategy, which is usually neglected in present LSM‐based permafrost modeling studies.

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“…Note that the main differences between these products relate to the choice of meteorological and radiation forcing. Next, we estimated the multiyear (2001-2018) monthly terrestrial actual evapotranspiration (E) and its spatial distribution on the Tibetan Plateau (TP) using the surface energy balance system (SEBS) forced by a combination of meteorological data and satellite products [53].…”

Section: Evaluation and Generation Of Land Heat Fluxes And Evapotranspirationmentioning

confidence: 99%

Monitoring Water and Energy Cycles at Climate Scale in the Third Pole Environment (CLIMATE-TPE)

Chen

et al. 2021

Remote Sensing

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A better understanding of the water and energy cycles at climate scale in the Third Pole Environment is essential for assessing and understanding the causes of changes in the cryosphere and hydrosphere in relation to changes of plateau atmosphere in the Asian monsoon system and for predicting the possible changes in water resources in South and East Asia. This paper reports the following results: (1) A platform of in situ observation stations is briefly described for quantifying the interactions in hydrosphere-pedosphere-atmosphere-cryosphere-biosphere over the Tibetan Plateau. (2) A multiyear in situ L-Band microwave radiometry of land surface processes is used to develop a new microwave radiative transfer modeling system. This new system improves the modeling of brightness temperature in both horizontal and vertical polarization. (3) A multiyear (2001–2018) monthly terrestrial actual evapotranspiration and its spatial distribution on the Tibetan Plateau is generated using the surface energy balance system (SEBS) forced by a combination of meteorological and satellite data. (4) A comparison of four large scale soil moisture products to in situ measurements is presented. (5) The trajectory of water vapor transport in the canyon area of Southeast Tibet in different seasons is analyzed, and (6) the vertical water vapor exchange between the upper troposphere and the lower stratosphere in different seasons is presented.

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Long-term variations in actual evapotranspiration over the Tibetan Plateau

Cited by 65 publications

References 46 publications

Dominant Modes of Tibetan Plateau Summer Surface Sensible Heating and Associated Atmospheric Circulation Anomalies

Dominant Modes of Tibetan Plateau Summer Surface Sensible Heating and Associated Atmospheric Circulation Anomalies

On the Spin‐Up Strategy for Spatial Modeling of Permafrost Dynamics: A Case Study on the Qinghai‐Tibet Plateau

Monitoring Water and Energy Cycles at Climate Scale in the Third Pole Environment (CLIMATE-TPE)

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