Topic
Tectonic–climatic interaction
About: Tectonic–climatic interaction is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 162 citations.
Papers
TL;DR: In this article, the authors examined the stability of the South Asian monsoon (SAM) system to global climate change and addressed the issue of likely future changes in the SAM in response to global warming using simulations from an ultra-high resolution (20 km) global climate model.
Abstract: Understanding the response of the South Asian monsoon (SAM) system to global climate change is an interesting scientific problem that has enormous implications from the societal viewpoint. While the CMIP3 projections of future changes in monsoon precipitation used in the IPCC AR4 show major uncertainties, there is a growing recognition that the rapid increase of moisture in a warming climate can potentially enhance the stability of the large-scale tropical circulations. In this work, the authors have examined the stability of the SAM circulation based on diagnostic analysis of climate datasets over the past half century; and addressed the issue of likely future changes in the SAM in response to global warming using simulations from an ultra-high resolution (20 km) global climate model. Additional sensitivity experiments using a simplified atmospheric model have been presented to supplement the overall findings. The results here suggest that the intensity of the boreal summer monsoon overturning circulation and the associated southwesterly monsoon flow have significantly weakened during the past 50-years. The weakening trend of the monsoon circulation is further corroborated by a significant decrease in the frequency of moderate-to-heavy monsoon rainfall days and upward vertical velocities particularly over the narrow mountain ranges of the Western Ghats. Based on simulations from the 20-km ultra high-resolution model, it is argued that a stabilization (weakening) of the summer monsoon Hadley-type circulation in response to global warming can potentially lead to a weakened large-scale monsoon flow thereby resulting in weaker vertical velocities and reduced orographic precipitation over the narrow Western Ghat mountains by the end of the twenty-first century. Supplementary experiments using a simplified atmospheric model indicate a high sensitivity of the large-scale monsoon circulation to atmospheric stability in comparison with the effects of condensational heating.
171 citations
TL;DR: In this article, a regional climate model is used to simulate the summer monsoon onset in South and Southeast Asia during the year 2000 to explore the interaction between orographic precipitation and the large-scale monsoon circulation.
Abstract: A regional climate model is used to simulate the summer monsoon onset in South and Southeast Asia during the year 2000 to explore the interaction between orographic precipitation and the large-scale monsoon circulation. In the control run, the model uses the U. S. Geological Survey topography data and simulates the observed monsoon onset reasonably well. In the sensitivity tests, mountains are removed within different regions south of the Tibetan Plateau. It is found that the Indochina Peninsula monsoon onset is closely related to the local wind–terrain–precipitation interaction, while the Indian monsoon onset is more controlled by the large-scale land–sea thermal contrast.The sensitivity tests suggest two opposite effects of high terrain on the monsoon circulation and precipitation. When the terrain height is below the lifted condensation level (LCL), the low-level westerlies and the orographic precipitation weaken with increasing terrain height due to the surface drag effect. When the terrain he...
38 citations
1 Jan 1989
TL;DR: A geologic record of atmospheric circulation, based on information extracted from eolian dust preserved in deep-sea sediments, that extends back to the late Cretaceous and the late Oligocene in the southern hemisphere is presented in this article.
Abstract: There exists a reasonable geologic record of atmospheric circulation, based on information extracted from eolian dust preserved in deep-sea sediments, that extends back to the late Cretaceous in the northern hemisphere and to the late Oligocene in the southern hemisphere. On tectonic timescales of 500,000 years or longer, important changes in atmospheric circulation do not always occur in conjunction with known paleoenvironmental changes, such as times of ice buildup on continents. There appears to be essentially no change in wind intensity across the Cretaceous-Tertiary boundary. The single greatest change in wind intensity in the Cenozoic occurs at the Paleocene-Eocene boundary, a reduction of higher intensity Mesozoic and Paleocene circulation to the sluggish atmosphere of the middle Tertiary. Circulation intensity remained low throughout the Eocene and increased beginning in the Oligocene to a PlioPleistocene maxima. Southern hemisphere records show that the mid-Miocene increase in ice volume at 13 to 14 Ma does not correspond to an increase in wind intensity, suggesting that the inferred direct correspondence of glacial buildup to polar cooling may not always hold. There appears to be little response to the onset of northern hemisphere glaciation in the records of southern hemisphere atmospheric circulation — one indication of the independent behavior of the two hemispheres.
9 citations
TL;DR: Based on sedimentological information and detailed provenance analysis, it is suggested that tectonic uplift of the northern Tian Shan was likely the principal factor driving the change in sediment supply at ca. 7.3-2.5 Ma.
Abstract: [Based on sedimentological information and detailed provenance analysis, it is suggested that tectonic uplift of the northern Tian Shan was likely the principal factor driving the change in sediment supply at ca. 7.0 Ma. The shift in sedimentation at ca. 3.3–2.5 Ma was mostly occurred by the contemporaneous glaciation. The growth of the northern Tian Shan during the early Pleistocene might obey critical‐taper wedge theory highlights that crucial role of glaciation in driving physical erosion and surface processes in glacier‐covered mountainous ranges. , Abstract The Chinese Tian Shan is one of the most actively growing orogenic ranges in Central Asia. The Late Miocene‐Quaternary landscape evolution of northern Tian Shan has been significantly driven by the interaction between tectonic deformations and climate change, further modulated by the erosion of the upstream bedrocks and deposition into the downstream basins. In this study, only the accessible Kuitun River drainage basin in northern Tian Shan was considered, and detrital zircon geochronology and heavy minerals were analyzed to investigate the signature of the driving forces for Miocene sedimentation in northern Tian Shan. This study first confirmed a previously recognized tectonic uplift at ca. 7.0 Ma and further revealed that the basin sediments were mainly derived from the present glacier‐covered ridge‐crest regions during 3.3–2.5 Ma. It is suggested Late‐Pliocene to Early Pleistocene sedimentation was likely a response to the onset of the northern hemispheric glaciation. Although complicated, this study highlights that the tectonic‐climatic interaction during the Late Cenozoic orogenesis can be discriminated in the northern Chinese Tian Shan.]
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2013 | 1 |
| 2012 | 1 |
| 1989 | 1 |