What Speleothems Tell Us about Long-Term Rainfall Oscillation throughout the Holocene on a Planetary Scale

Pinault, Jean-Louis; Pereira, Lígia Sauaya

doi:10.3390/jmse9080853

Cited by 4 publications

(7 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, for the change in rainfall in the middle latitudes of NH, the reasons may be much more complex. In addition to the global insolation change, the consequent changes in ocean activities at the suborbital scale are also crucial, such as changes in the north AMOC [108,109]. Events on smaller time scales, such as the NAO, the PDO, and changes in ENSO and ITCZ [109][110][111], all directly or indirectly affect the rainfall oscillation of the middle latitudes of NH, including the Alashan Plateau in central Asia.…”

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

“…On the interannual and interdecadal scales, nearly periodic changes in precipitation have been observed around the world [109]. There are two main reasons for the periodic changes in this rainfall oscillation, namely, the El Niño Southern Oscillation (ENSO) and the sea surface temperature (SST) anomaly of subtropical gyres [120].…”

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

“…There are two main reasons for the periodic changes in this rainfall oscillation, namely, the El Niño Southern Oscillation (ENSO) and the sea surface temperature (SST) anomaly of subtropical gyres [120]. Compared with interannual and interdecadal variations of precipitation and ENSO events, rainfall oscillations on longer time scales (e.g., the Holocene period) have been observed in all latitudes of the world [109]. On the centennial, millennial, and 10,000-year time scales, the change of ENSO activity has a monotonic trend consistent with the change of solar radiation in the Holocene, which has continued to weaken since the middle Holocene [121].…”

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

“…Environmental proxy records and model simulations show that not only between the EASM and ISM control areas but also the Holocene rainfall oscillation, there are regional differences on a larger scale. For example, significant variability of the Holocene precipitation can be observed in South America and Asia, while it is relatively stable in Europe [109], which forms a sharp contrast in the long-term trend of global rainfall oscillations. This difference further suggests that the control mechanism of rainfall oscillations in Asia is different from that in Europe (which is controlled by ENSO activities) on centennial and millennial scales, and there are other potential mechanisms driving such climate change in Asia.…”

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

See 3 more Smart Citations

Desertification and Related Climate Change in the Alashan Plateau since the Last 40 ka of the Last Glacial Period

Zhu

Yang

2023

Atmosphere

View full text Add to dashboard Cite

Clues of climate change on the Alashan Plateau since the last glacial period (40 ka) are important for revealing the mechanism of desertification of middle-latitude deserts in the Northern Hemisphere (NH). Studies are still rare for the understanding of the specific relationship of climate changes between the Alashan Plateau and the global. Based on a systematic and comparative analysis of the existing research in China and the international academic community, this paper reviews the environmental evolution history of the Alashan Plateau since the last glacial period from the records of paleo-environment and geomorphological characteristics in different deserts of the plateau (e.g., Badanjilin, Tenggeli, and Wulanbuhe). From about 40 ka to the end of the last glacial maximum, the climate on the plateau was wetter than it is today, and to the end of the Pleistocene, the climate was generally dry and the aeolian activities were enhanced. However, the climate was arid during the whole last glacial period in the Wulanbuhe Desert, evidently different from the overall pattern of the plateau. The Tenggeli Desert was characterized by an arid climate in the early Holocene. The most controversial events for the Alashan Plateau are the drought events in the middle Holocene in the Badanjilin Desert. The role and impact of the westerlies and the East Asian Summer Monsoon (EASM) systems on the climate change of the desert and even the whole plateau is a vexed question that brings different views in different periods. There is still a lack of definite evidence representing the events of global environmental change that occurred on the plateau during the discussed period. The distinctive morphology of dune mountains and the distribution of sand dunes are mutually indicative of the direction and energy of wind systems on the plateau. It is suggested that appropriate wind energy is the significant key to the desertification in these middle-latitude deserts on the plateau. From a global-scale review of climate change, the desertification of the modern-scale sandy desert landscapes on the Alashan Plateau is generally related to the global glacial period and the cold and dry climate during the past 40 ka.

show abstract

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

Section: Role Of Holocene Insolation and Itcz On A Global Scalementioning

confidence: 99%

See 2 more Smart Citations

Desertification and Related Climate Change in the Alashan Plateau since the Last 40 ka of the Last Glacial Period

Zhu

Yang

2023

Atmosphere

View full text Add to dashboard Cite

show abstract

“…By breaking down speleothems used as archives of past climate into subharmonic modes, the following were shown: (1) how the weakening of ENSO activity occurred in the mid-Holocene and (2) the quasi-resonance of the equatorward migration of the summer Inter-Tropical Convergence Zone (ITCZ) during the Holocene as a result of the progressive decrease in the thermal gradient between the low and high latitudes of the gyres [30].…”

Section: Incidence Of the Gyral Rossby Waves On Climate: Some Examplesmentioning

confidence: 99%

Weakening of the Geostrophic Component of the Gulf Stream: A Positive Feedback Loop on the Melting of the Arctic Ice Sheet

Pinault

2023

JMSE

Self Cite

View full text Add to dashboard Cite

The North Atlantic gyre experiences both a significant temperature rise at high latitudes and a considerable weakening of the geostrophic component of the Gulf Stream, which is reflected by the 64-year fundamental gyral Rossby wave (GRW). This singular behavior compared to the South Atlantic and South Indian Ocean gyres highlights a feedback loop of Arctic ice sheet melting on mid-latitude Atlantic Ocean temperature. The warming of the northern oceanic gyre at high latitudes due to the retreat of Arctic ice sheet via the Labrador Current decreases the thermal gradient between the high and low latitudes of the north Atlantic gyre. This results in a weakening of the geostrophic forces at the basin scale and a reduction in the amplitude of the GRWs. Reducing the amplitude of the variation of the upward and downward movement of the pycnocline modifies air–sea interactions, weakening vertical mixing as well as the evaporation processes and the departure of latent heat when the pycnocline rises. The resulting thermal anomaly stretching along the Gulf Stream from where it leaves the American continent is partly transferred to the Arctic sea ice via the drift current and thermohaline circulation, which contributes to the retreat of the ice sheet, and the closing of the feedback loop. The 64-year-period GRW should disappear around 2050 if its damping continues linearly, favoring an increasingly rapid warming of the ocean at mid-latitudes. These interactions are less acute in the southern hemisphere due to the circumpolar current.

show abstract

Speleothems

Braun,

Latham

2023

Encyclopedia of Geoarchaeology

View full text Add to dashboard Cite

What Speleothems Tell Us about Long-Term Rainfall Oscillation throughout the Holocene on a Planetary Scale

Cited by 4 publications

References 45 publications

Desertification and Related Climate Change in the Alashan Plateau since the Last 40 ka of the Last Glacial Period

Desertification and Related Climate Change in the Alashan Plateau since the Last 40 ka of the Last Glacial Period

Weakening of the Geostrophic Component of the Gulf Stream: A Positive Feedback Loop on the Melting of the Arctic Ice Sheet

Speleothems

Contact Info

Product

Resources

About