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45 results for “Asian Monsoon”
CAIRT FL2S Results of Case Study Scenario 10 (CSS10) for Asian Summer Monsoon
<p>Results of the fast level-2 simulator (FL2S) of CAIRT developed within the Earth Explorer 11 Phase 0 Science and Requirements Consolidation Study (SciReC) – CAIRT. The files contain altitude-time cross-sections of atmospheric parameters along simulated CAIRT-orbits. The variable extensions denote the original field ('_ori'), the application of the averaging kernel ('_ak'), additional application of noise ('_aknoi'), application of systematic uncertainties ('_sys'), and application of all effects ('_aknoisys'). Further information is available from the authors.</p>
Detection of abrupt changes in East Asian monsoon from Chinese loess and speleothem records
<p>There is a great interest concerning recent occurrences of tipping points in the climate system and great concern about those that could occur in the near future as a result of anthropogenic forcing. A lot of attention has been devoted to the study of past Dansgaard-Oeschger events, abrupt warmings of about 12°C on a time-scale of about 50 yrs that occurred during the last glacial period. Great effort is also dedicated to understanding the Atlantic Meridionnal overturning circulation and the Amazon forest dieback, which are already entering an unstable regime leading to tipping behavior.</p> <p>Instead, here we focus on the study of critical transitions in the SE Asian Monsoon that have occurred in the past 3.6 Myrs by a novel combination of advanced statistical tools (KS-test, recurrence quantification analysis). The SE Asian Monsoon is characterized by variations in the grain size with the occurrence of coarse material characterizing a strong winter monsoon mechanism with grains transported from the Chinese northern deserts by strong winds generated by the Siberian High located northward. By contrast intervals of fine grain size characterized periods during which the summer monsoon was rather reinforced. We have analyzed high-resolution grain-size datasets derived from Chinese loess sequences, i.e. the CHILOMOS and the LGS640 datasets, that we compare with the Chinese composite speleothem d<sup>18</sup>O records that arguably provide one the best representation of the Earth’s climate in the last 650 kyrs. Although visually observed rapid grain-size variations were previously interpreted as representing millennial-scale variations, our statistical analysis shows that both winter and summer monsoons co-varied at glacial-interglacial to millennial timescales. Analyzing a third dataset, i.e., MQSG, our statistical analysis shows that both winter and summer monsoon variations reflect a three-stage evolution of increasing intensity: (1) from 3.6 Ma to 2.6 Ma, (2) from 2.6 Ma to 1.2 Ma, and (3) from 1.2 Ma to present, with the winter monsoon strength increasing over these3 main steps.</p> <p>List of tables</p> <p><strong><span>Table 1</span></strong><span> KS test of the NGRIP and Hulu cave </span><span>d</span><sup><span>18</span></sup><span>O for the last climate cycle. Comparison of the dates of abrupt warmings/moistening (left) and cooling/drying transitions (right). Labels for NGRIP according to Rasmussen et al. </span><span><span>(2014)</span></span><span> and for Hulu cave according to Wang et al. </span><span><span>(2008)</span></span><span>. </span></p> <p><strong><span>Table 2</span></strong><span> KS test of the Chinese speleothem </span><span>d</span><sup><span>18</span></sup><span>O and of the CHILOMOS grain-size composite for the last two climate cycles. Comparison of the dates of abrupt moistening (left) and drying transitions (right). Labels for the moistening transitions in the Chinese speleothem are from Wang et al. </span><span><span>(2008)</span></span><span> and in CHILOMOS from Yang and Ding </span><span><span>(2014)</span></span><span>. The labels of the drying in CHILOMOS are from the present study</span></p> <p><strong><span>Table 3</span></strong><span> RQA of the Chinese speleothem </span><span>d</span><sup><span>18</span></sup><span>O and of the CHILOMOS grain-size composite for the last two climate cycles. Dates of the minima are identified by the RR prominence, shown together with the equivalent transitions detected by the KS method. For easier reading, the dates have been re-ordered from younger to older. The most significant minima are highlighted in yellow. The original ranking is given in Suppl. Tab 1.</span></p> <p><strong><span>Table 4 </span></strong><span>KS test of the Chinese speleothem<span> </span></span><span>d</span><sup><span>18</span></sup><span>O and of the LGS640 dataset for the last 640 Myrs. Comparison of the dates of abrupt moistening and drying transitions in both records. The dates found in both records are highlighted in red and in blue for drying or moistening events respectively.</span></p> <p><strong><span>Table 5 </span></strong><span>RQA of the LGS640 grain-size composite for the last seven climate cycles. Dates of the minima are identified by the RR prominence. The most significant minima (RR prominence >0.5) are highlighted in yellow. </span></p> <p><span><span> </span><strong>Table 6 </strong>KS test and<strong> </strong>RQA of MGSQ grain dataset for the last 3.6 Myrs. In this analysis the moistening and drying transitions is labeled as warming and cooling. On the left, KS results with the corresponding marine isotope stage (MIS) boundaries. On the right, RQA results with minima ordered according their prominence value. Dates with RR>0.6 are highlighted in yellow. </span></p> <p><strong><span>Table Supp.1.</span></strong><span> Abrupt transitions over the past 130 kyrs BP from the NGRIP, Chinese Speleothem and CHILOMOS records. Identification of the common abrupt warmings or moistenings on the left, and abrupt coolings or dryings on the right.<span> </span>Differences between the highest and lowest transition dates. Indication of the NGRIP and Chinese interstadials and stadials (GI-GS and A-SA respectively).</span></p> <p><strong><span>Table Supp.2.</span></strong><span> RQA of the 250 kyrs Chinese speleothem and CHILOMOS records ranked according the RR prominence, the chronology. Indication of the time difference between the identified transitions.</span></p> <p><strong><span>Table Supp.3.</span></strong><span> Comparison of the KS-test results from the LGS 640 and the Chinese speleothem over the past 650 kyrs. Indication of the Marine isotope stratigraphy and the number of cool and warm transitions and the percentage of drying events per climate cycle</span></p>
Data used in "Climatology and variability of air mass transport from the boundary layer to the Asian monsoon anticyclone"
<p>The data presented here are needed to reproduce the analyses of the publication: Nützel, M., Brinkop, S., Dameris, M., Garny, H., Jöckel, P., Pan, L. L., and Park, M.: Climatology and variability of air mass transport from the boundary layer to the Asian monsoon anticyclone, Atmos. Chem. Phys., 22, 15659–15683, https://doi.org/10.5194/acp-22-15659-2022, 2022. A short explanation of the archived data is presented in the accompanying README.</p> <p>Note: In the previous data set version (<a href="https://doi.org/10.5281/zenodo.7275804">10.5281/zenodo.7275804</a>) one file was missing and is added here.</p> <p> </p> <p> </p>
Tree-ring stable isotopes suggest an increase in Asian monsoon rainfall at 4.2 ka BP
<p>A synthesis of stable oxygen isotope records from tree rings and speleothems does not support a significant hydroclimate transition in our study region around 4.2 ka, nor the notion that this rapid climate deterioration should be regarded as generalized climatic transition from the mid to late Holocene. </p>
Replication materials for "Effects of Urbanization in China on the East Asian Summer Monsoon as Revealed by Two Global Climate Models"
<p>The datasets are replication materials for the research "Effects of Urbanization in China on the East Asian Summer Monsoon as Revealed by Two Global Climate Models". They show urbanization-induced changes in surface air temperature (SAT), precipitation, and 850hPa atmospheric circulation from two global climate models (NCAR CESM1.2.1 and FGOALS-g3).</p>
Orbital effect on millennial-scale East Asian summer monsoon variability during the Holocene
<p>Data for reproducing figures in journal article submitted to JGR: Atmospheres in June 2022.</p> <p>Data generated from hosing simulations of the 8.2 ka BP and 4.2 ka BP events using the CESM1.2.</p>
Variability of the East Asian winter monsoon since mid-late Holocene
<p>Wind speed of the East Asian winter monsoon since 4.4 ka was quantitatively reconstructed at a high temporal resolution (~4 years) based on grain size of a core sediment from a well preserved mud patch in the North Yellow Sea.</p>
Investigating sensitivity of East Asian monsoon to orbital forcing during the Late Pliocene warm period
<p>CESM model outputs in a set of orbital sensitivity runs for the Late Pliocene.</p> <p>Only for the East Asia region</p> <p> </p>
A high-resolution speleothem record of Marine Isotope Stage 11 as a natural analog to Holocene Asian summer monsoon variations
<p>A full-spectrum characterization of past interglacial climate is a necessary prerequisite for the detection and attribution of climate changes during the current interglacial. Here we present a speleothem record of Asian summer monsoon (ASM) during Marine Isotope Stage (MIS) 11 interglacial (MIS 11c), from Yongxing cave, China. The record’s unprecedented chronologic constraints and decadal-scale temporal resolution allow a precise and direct comparison of ASM between the MIS 11c and the Holocene. Our data suggest that orbital–centennial patterns of ASM were remarkably similar during both interglacial, including their pacing and structure. Notably, a multi-millennial stronger monsoon late in MIS 11c, the ‘Late-MIS 11c shift’, is similar to the Late Holocene strengthening of the ASM, the ‘2-kyr shift’. Thus the multi-centennial ASM weakening at the end of the ‘Late-MIS 11c shift’ could imply that the current century-long ASM waning trend may persist into the future, if only natural forcings are considered.</p>
Supplementary animation of the article by Khaykin et al. Persistence of moist plumes from overshooting convection in the Asian monsoon anticyclone""
<p>Back trajectories released at B7 point of StratoClim Geophysica flight F7</p>
Changing patterns of the East Asian monsoon drive shifts in migration and abundance of a globally important rice pest
<p>Numerous insects including pests and beneficial species undertake windborne migrations over hundreds of kilometers. In East Asia, climate-induced changes in large-scale atmospheric circulation systems are affecting wind-fields and precipitation zones and these, in turn, are changing migration patterns. We examined the consequences in a serious rice pest, the brown planthopper (BPH, <em>Nilaparvata</em> <em>lugens</em>) in East China. BPH cannot overwinter in temperate East Asia, and infestations there are initiated by several waves of windborne spring or summer migrants originating from tropical areas in Indochina. The East Asian Summer monsoon, characterized by abundant rainfall and southerly winds, is of critical importance for these northward movements. We analyzed a 42-year dataset of meteorological parameters and catches of BPH from a standardized network of 341 light-traps in South and East China. We show that south of the Yangtze River during summer, southwesterly winds have weakened and rainfall increased, while the summer precipitation has decreased further north on the Jianghuai Plain. Together, these changes have resulted in shorter migratory journeys for BPH leaving South China. As a result, immigration levels of pest outbreaks of BPH in the key rice-growing area of the Lower Yangtze River Valley (LYRV) have declined since 2001. We show that these changes to the East Asian summer monsoon weather parameters are driven by shifts in the position and intensity of the Western Pacific subtropical high (WPSH) system that have occurred in the last 20 years. As a result, the relationship between WPSH intensity and BPH immigration that was previously used to predict the size of the immigration to the LYRV has now broken down. Our results demonstrate that migration patterns of a serious rice pest have shifted in response to the climate-induced changes in precipitation and wind pattern, with significant consequences for the population management of migratory pests.</p>
Identification of the atmospheric water sources and pathways responsible for the East Asian summer monsoon rainfall
<p><strong>era_hydro_easm_jul2013_*.csv.gz:</strong> These three files are the raw output from the TRACMASS trajectory model. They stored positions of each trajectory at the start (ini file), during run (run file) and at the end (out file) during July 2013 and has been used for generating Figure 1.</p> <p><strong>mask.nc:</strong> The basin definition in Figure 1 was plotted using this netcdf file.</p> <p><strong>ep_traj_*.gz: </strong>The four zip files corresponds to four summer months (June, July, August, and September) and used to plot Figure 2.</p> <p><strong>ep_traj_basins_*.gz: </strong>The four zip files corresponds to four summer months (June, July, August, and September) and used to plot Figure 3.</p> <p><strong>quantification.gz: </strong>These files were used for quantification provided in Figure 4 and Figure 8.</p> <p><strong>traj_pathways_*.gz: </strong>The two zip files (one for the South Indian Ocean, SIO and another for the Pacific Ocean, PAC) were used to generate Figure 5.</p> <p><strong>traj_rt.gz: </strong>The residence time of atmospheric waters in Figure 6 was created using the files in this zip.</p> <p><strong>traj_age_*.gz: </strong>The two zip files (one for the South Indian Ocean, SIO and another for the Pacific Ocean, PAC) were used to generate Figure 7.</p>
Remote insolation forcing of orbital-scale South Asian summer monsoon variability
<p>CESM simulation data for the manuscript "Remote insolation forcing of orbital-scale South Asian summer monsoon variability", which has been submitted to Geophysical Research Letters.</p>
Variation of the Asian summer monsoon since the last glacial-interglacial recorded in a stalagmite from southwest China
<p>A high-precise 230Th dated stalagmite from southwestern China was used to reconstruct the changes of ASM and regional hydrological conditions since the last interglacial (3.6–118.1 ka BP) by the coupled δ18O and δ13C. </p>
Quantitative interpretation of the physical processes associated with the interannual variation of South Asian summer monsoon
<p>This is the CFRAM-A data of "Quantitative interpretation of the physical processes associated with the interannual variation of South Asian summer monsoon". The data includes 10 years: 1997, 1999, 2000, 2001, 2008, 2009, 2013, 2015, 2018, and 2019. Each year includes two "nc" data, one is the partial temperature, the other is the total temperature.</p>
Supplement A. Wolf et al: 'Deciphering local and regional hydroclimate resolves contradicting evidence on the Asian monsoon evolution'
<p>This repository contains all proxy data for TD3 and codes with instructions and examples presented and use in A. Wol et al, "Deciphering local and regional hydroclimate resolves contradicting evidence on the Asian monsoon evolution". The data can be used to replicate figures and analyses presented in the main text. </p>
Changing patterns of the East Asian monsoon drive shifts in migration and abundance of a globally important rice pest
Open the record for dataset details and reuse information.
Tree-ring stable isotopes suggest an increase in Asian monsoon rainfall at 4.2 ka BP
Open the record for dataset details and reuse information.
Observed trends in the South Asian monsoon low-pressure systems and rainfall extremes since the late1970s
<p>LPS tracks for the manuscript "Observed trends in the South Asian monsoon low-pressure systems and rainfall extremes since the late1970s"</p>
Tracing the origin of the South Asian summer monsoon precipitation and its variability using a novel Lagrangian framework
<p>moc.zip: This dataset was used to calculate the meridional overturning water-mass stream function (Fig.2) and net evaporation which are responsible for net precipitation over the South Asian landmass during June to September months (Fig.3).</p> <p>track_amp.zip: The vertically integrated horizontal water-mass flux was computed from this data (Fig.4).</p> <p>bob_path.zip: Net precipitation (Fig.5) and net evaporation (Fig.6) calculated from Lagrangian water-mass trajectories that have crossed over the Bay of Bengal at least once and fallen down over the South Asian landmass. Also, Table 2 was prepared using this data.</p> <p>evap_precip_basins.zip: This file contain datasets that were used to compute the contribution of separate basins to the South Asian summer monsoon precipitation (Table 1) and also how the spatial distribution related to each basin (Fig.7)</p> <p>interannual.zip: Interannual precipitation variability was obtained from this dataset.</p>
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