Publication Date:
2024-05-22
Description:
〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The movement of active dunes is tightly linked to climatic conditions (e.g., wind regime, temperature and precipitation) as well as human influence (e.g., grazing, dune fixation and greening). Dune migration rates can be studied to draw conclusions of changing wind conditions over time. The Gonghe Basin (GB), located on the north‐eastern Tibetan Plateau (TP), offers a good testing ground for these assumptions. The intramontane basin is highly influenced by two major wind regimes: the mid‐latitude Westerlies and the East Asian summer monsoon. To investigate environmental changes, this study combines optical remote sensing techniques with climatic datasets. High‐resolution satellite images of the last five decades, such as CORONA KH‐4B, are used to map dunes and calculate their respective migration rates. Further, height information was extracted as well. Climatic changes from the ERA‐5 reanalysis dataset and normalized difference vegetation index (NDVI) values were processed alongside. Relating the dunes' surface processes to climate model data shows an accordance between slowing migration, expanding vegetation and a decrease in sand drift potential. From 1968 to present time, an average dune migration rate of 7.3 m a〈sup〉−1〈/sup〉 was extracted from the satellite images, with an overall reduction of −1.81 m a〈sup〉−1〈/sup〉. The resultant drift potential (RDP) values for the GB are calculated to be below 10 m〈sup〉3〈/sup〉 s〈sup〉−3〈/sup〉 with a spatial decrease, following a direction from the NW to the SE, fitting well with a corresponding decrease in the migration rates. Our results indicate a good agreement between the development of aeolian landforms and the ERA‐5 climate reanalysis model data, even in a high‐altitude setting with complex topography, which is known to influence such datasets.〈/p〉
Description:
〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉We investigate climatic changes of the past 5 decades in the Gonghe Basin by using a wide range of remote sensing data. Era‐5 data is compared with dune migration rates. The dunes' behaviour is very well represented within the ERA‐5 data and shows a slowing migration over the past five decades. This fits well to climatic developments, like increasing precipitation and temperature. Sand drift potential was calculated and interpolated to pinpoint resultant drift potential (RDP) values to individual barchans.
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Description:
Federal Ministry of Education and Research of Germany (BMBF)
Description:
National Key Research and Development Program of China
http://dx.doi.org/10.13039/501100012166
Keywords:
ddc:551.3
;
climate change
;
CORONA KH‐4B
;
dunes
;
ERA‐5
;
satellite remote sensing
;
Tibetan Plateau
Language:
English
Type:
doc-type:article
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