Abstract
Siberia and Central Asia are located at middle to high latitudes, encompassing a large landlocked area of the Eurasian continent and vast tracts of permafrost, which are sensitive to global climate change. Here, we investigated the data from 15 Global Network of Isotopes in Precipitation (GNIP) stations to clarify the relationship between precipitation δ18O (δ18OP) and the local temperature and precipitation amount on the monthly, seasonal, and annual timescales. Three main conclusions as following: (1) On the monthly time scale, the variation in δ18OP is mainly controlled by the “temperature effect”. (2) The weighted average value of precipitation δ18O (δ18Ow) exhibited “temperature effect” over 60° N–70° N. However, δ18Ow was dominated by multiple factors from 40° N to 60° N (e.g., the North Atlantic Oscillation (NAO) and water vapor source changes). (3) The variations of δ18OW can be attributed to the changes in pathway of the westerly dominated by the NAO at annual timescale. Therefore, it is possible to reconstruct the histories of past atmospheric circulations and water vapor sources in this region via δ18O in geologic archives, e.g., speleothem and ice core records.
Highlights
The stable oxygen isotopic compositions (δ18 O) of ice cores, tree rings, ocean sediments, and cave speleothems have been widely used as proxies for paleo-climatic change
Subsequent related studies indicated that factors influencing the changes in δ2 HP and δ18 O of modern atmospheric precipitation (δ18 OP) exhibited distinct characteristics at different latitudes, e.g., the variations in δ18 OP over middle and high-latitude regions are dominated by temperature, while those at low latitudes are dominated by precipitation
The δ18 OP followed a similar trend, that is, the maximum values were observed in July, and the minimum values were observed between December and February (Figure 2)
Summary
The stable oxygen isotopic compositions (δ18 O) of ice cores, tree rings, ocean sediments, and cave speleothems have been widely used as proxies for paleo-climatic change. Changes in the source of water vapor and in the atmospheric circulation pattern can result in variations in δ2 HP and δ18 OP [11,12]. Regional temperature affects the decadal winter variations in δ18 OP , but the inter-annual summer variations in δ18 OP can be attributed to short-term regional scale processes, such as evaporation and convective precipitation [16,35] Though it has been proposed in some research that δ18 OP changes in Siberia can be attributed to temperature effect and variations in the source of water vapor, there are still some pending scientific questions to consider. (1)ofvariations in the characteristics of atmospheric precipitation these observed data in different patterns atmospheric circulation, the following scientific issues have isotopes in Siberia region (1). Regional δ monitoring endeavors, and facilitating paleo-climatic reconstruction efforts via regional δ O proxies
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