Increasing lake evaporation over the Holocene revealed by oxygen stable isotope in Indian-monsoon dominated southwestern China

Cheng, Yanan; Zhang, Can; Li, Yanling; Li, Xiangzhong; Liu, Weiguo; Zhao, Cheng

doi:10.1016/j.gloplacha.2023.104217

Cited by 1 publication

(1 citation statement)

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“…These results suggest that reduced summer precipitation may contribute substantially to the P–E changes in the central Andes. Conversely, as northern hemisphere monsoons weakened over the Holocene, water balance became more negative (e.g., Cheng et al., 2023; Haug et al., 2001; Metcalfe et al., 2015). The stable lake water temperatures in the Lake Junín region (Figure 5c) suggest the influence of temperature on evaporation rates may have been relatively stable over the Holocene.…”

Section: Discussionmentioning

confidence: 99%

Holocene Temperature and Water Stress in the Peruvian Andes: Insights From Lake Carbonate Clumped and Triple Oxygen Isotopes

Katz,

Levin,

Abbott

et al. 2024

Paleoceanog and Paleoclimatol

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Global climate during the Holocene was relatively stable compared to the late Pleistocene. However, evidence from lacustrine records in South America suggests that tropical latitudes experienced significant water balance variability during the Holocene, rather than quiescence. For example, a tight coupling between insolation and carbonate δ18O records from central Andean lakes (e.g., Lakes Junín, Pumacocha) suggest water balance is tied directly to South American summer monsoon (SASM) strength. However, lake carbonate δ18O records also incorporate information about temperature and evaporation. To overcome this ambiguity, clumped and triple oxygen isotope records can provide independent constraints on temperature and evaporation. Here, we use clumped and triple oxygen isotopes to develop Holocene temperature and evaporation records from three central Andean lakes, Lakes Junín, Pumacocha, and Mehcocha, to build a more complete picture of regional water balance (P–E). We find that Holocene water temperatures at all three lakes were stable and slightly warmer than during the latest Pleistocene. These results are consistent with global data assimilations and records from the foothills and Amazon basin. In contrast, evaporation was highly variable and tracks SASM intensity. The hydrologic response of each lake to SASM depends greatly on the physical characteristics of the lake basin, but they all record peak evaporation in the early to mid‐Holocene (11,700 to 4,200 years BP) when regional insolation was relatively low and the SASM was weak. These results corroborate other central Andean records and suggest synchronous, widespread water stress tracks insolation‐paced variability in SASM strength.

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Section: Discussionmentioning

confidence: 99%