Modeling the climatic implications and indicative senses of the Guliya δ<sup>18</sup>O-temperature proxy record to the ocean–atmosphere system during the past 130 ka

Abstract

Abstract. Using an intermediate-complexity UVic Earth System Climate Model (UVic Model), the geographical and seasonal implications and indicative senses of the Guliya temperature proxy found in the Guliya δ18O ice core record (hereinafter, the Guliya δ18O-temperature proxy record) are investigated under time-dependent orbital and CO2 forcings with an acceleration factor of 50 over the past 130 ka. The results reveal that the simulated August–September Guliya surface air temperature (SAT) reproduces the 21-ka precession and 43-ka obliquity cycles of the Guliya δ18O-temperature proxy record, showing an in-phase variation with the latter. Moreover, the Guliya δ18O-temperature proxy record may be also an indicator of the August–September Northern Hemispheric (NH) SAT. Corresponding to the difference between the extreme warm and cold phases of the precession cycle in the Guliya August–September SAT, there are two anomalous patterns in SAT and sea surface temperature (SST). The first anomalous pattern shows increases of SAT and SST toward the Arctic, which is possibly associated with an increase of the NH incoming solar radiation that is caused by the in-phase superposition between the precession and obliquity cycles. The second anomalous pattern shows increases of SAT and SST toward the equator, which is possibly due to a decrease of incoming solar radiation over the NH polar that results from the anti-phase counteraction between the precession and obliquity cycles. The summer (winter) Guliya and NH temperatures are higher (lower) in the warm phases of the August–September Guliya than in their cold phases. Moreover, in August–September, the Guliya SAT is closely related to the North Atlantic SST, in which the Guliya precipitation might act as a "bridge" linking the Guliya SAT and the North Atlantic SST.

Precessional forced extratropical North Pacific mode and associated atmospheric dynamics

“…This model is called the UViC Earth System Climate Model (UViC_ESCM, version 2.9) [ Weaver et al ., ] and includes a single‐layer energy‐moisture balance atmospheric model and a 19‐level ocean general circulation model with a horizontal resolution of 3.6° × 1.8° in longitude and latitude. After reaching an equilibrium state, this model was run for 2600 model years with an acceleration factor of 50 under the orbital insolation forcing during the past 130 kyrs [ Xiao et al ., ]. We also performed an EOF analysis on four‐dimensional (longitude, latitude, 12 months, and 2600 model years) SST data set over the Pacific (40°S–60°N, 100°E–80°W).…”

Responses of the summer Asian-Pacific zonal thermal contrast and the associated evolution of atmospheric circulation to transient orbital changes during the Holocene

“…The land surface model employs the MOSES (Met Office Surface Exchange Scheme) model. The UVic Model is often used as a tool for understanding the physical process and feedback in the climate system on long timescales, and is widely used in paleoclimate, present climate, and future climate studies4142434445. This model could reasonably reproduce temperature, precipitation, and ocean circulation, with relatively small errors, even compared with the coupled General Circulation Model (GCM)42.…”

“…The monthly concentration of δ 18 O in Guliya is shown to be highly related to the local monthly surface air temperature57. Further studies disclosed that the Guliya δ 18 O record could indicate summer temperatures over the Tibetan Plateau during the past 130 ka4458. The Northern California SST was reconstructed from the alkenone in the Ocean Drilling Program (ODP) Site 1019 (ODP 1019), with a water depth of 980 m55.…”

末次间冰期以来北大西洋深层海温与青藏高原气温的千年尺度位相关系及其演变

“…例如, 在过去 60 ka, 格陵兰气温和东亚冬季风 强度大体上是相关联的, 数值模拟表明, 北大西洋经 向反转流通过激发北半球西风异常来把信号传递到 亚洲季风区 [21] . [22,23] . 北大西洋底栖有孔虫类壳体的氧同位素记 [24] .…”