the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Drought reconstruction since 1796 CE based on tree-ring widths in the Upper Heilongjiang (Amur) River Basin in Northeast Asia, and its linkage to Pacific Ocean climate variability
Yang Xu
Heli Zhang
Shijie Wang
Mao Hu
Martín Hadad
Fidel Roig
Abstract. The economic and environmental impacts of persistent droughts in East Asia are of growing concern, and therefore it is important to study the cyclicity and causes of these regional droughts. The self-calibrating Palmer Drought Severity Index (scPDSI) has been extensively employed to describe the severity of regional drought, and several PDSI reconstructions based on tree rings have been produced. We compiled a tree-ring chronology for Hailar pine (Pinus sylvestris var. Mongolica) from two sites in the Hailar region in the Upper Heilongjiang (Amur) River Basin. Analysis of the climate response revealed that scPDSI was the primary factor limiting tree ring growth from May to July. The mean May to July scPDSI in the Hailar region since 1796 was reconstructed from the tree-ring width chronology. The results of spatial correlation analysis revealed that the reconstructed scPDSI in this region responded significantly to climate change. Analysis of the synoptic climatology indicated that the drought in the Upper Heilongjiang (Amur) River Basin is closely related to ENSO and the Silk Road teleconnection. The results of atmospheric water cycle analysis show that water vapor transport processes are the dominant factor in the development of drought in this region.
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Yang Xu et al.
Status: open (until 19 Jul 2023)
Yang Xu et al.
Yang Xu et al.
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