TY  - Data
T1  - Impact of soil temperature-difference on desert carbon-sink
A1  - Huang Jianping
DO  - 10.5061/dryad.0zpc866tw
PY  - 2024
DA  - 2024-03-26
PB  - National Cryosphere Desert Data Center
AB  - The global carbon cycle is crucial for climate change. Deserts, which have long been overlooked in the global carbon cycle, can sequester large amounts of carbon dioxide and serve as carbon sinks. As the world's second-largest mobile desert, the Taklamakan Desert (TD) has made significant contributions to desert carbon sequestration. However, the contribution of internal processes in the Taklamakan Desert to its carbon sink and the long-term trend of carbon sink under climate change are still unclear. This study will fill this important knowledge gap. Through field observations, we found that the expansion/contraction of soil air containing carbon dioxide caused by heat fluctuations, combined with salt/alkali chemical reactions, dominates the release/absorption process of carbon dioxide in moving sand. The mutual cancellation of these processes means that quicksand in tropical arid regions is a stable carbon sink, absorbing 1.60 × 106 t · a-1of carbon dioxide annually from 2004 to 2017. This indicates that global mobile deserts may absorb approximately 2.125 × 108 tons of carbon dioxide annually. However, in the context of climate change, the increase in soil temperature difference will stimulate the expansion of soil air in deserts and release more carbon dioxide into the atmosphere, leading to a gradual reduction of mobile sand carbon sinks in future TD. Under the positive feedback of climate change, these processes will accelerate and exacerbate regional warming. These conclusions are crucial for a renewed understanding of the role of deserts in the carbon cycle.
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/ff2bea4a-82e3-418f-913e-398219cfbdf0
ER  -