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Carbon cycle variability in tropical atlantic across two Early Eocene hyperthermals

Geoscience Frontiers 2021年第2期12卷 521-530页

作者： Shijun Jiang Ying Cui Yasu Wang Institute of Groundwater and Earth Sciences Jinan UniversityGuangzhou510632China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082China Department of Earth and Environmental Studies Montclair State UniversityMontclairNJ07043USA

Early Eocene hyperthermals are geologically short-lived global warming events and represent fundamental perturbations to the global carbon cycle and the Earth’s ecosystem due to massive additions of isotopically light carbon to the ocean-atmosphere *** serve as ancient analogs for understanding how the oceanic carbonate system and surface-ocean ecosystem would respond to ongoing and future climate ***,we present a continuous carbonate record across the Eocene Thermal Maximum 2(ETM2 or H1,ca.54.1 Ma)and H2(ca.54 Ma)events from an expanded section at Ocean Drilling Program Site 1258 in tropical *** abundant calcareous nannofossils and moderate carbonate content throughout the studied interval suggest this record was deposited above the calcite compensation depth(CCD),but below the lysocline and under the influence of terrestrial *** Earth system model cGENIE is used to simulate the carbon cycle dynamics across the ETM2 and H2 to offer insights on the mechanism of the rapid warming and subsequent recovery in climate and *** model suggests moderate changes in ocean pH(0.1–0.2 unit)for the two scenarios,biogenic methane from a rechargeable methane capacitor and organic matter oxidation from thawing of the *** pH changes are consistent with a recent independent pH estimate across the ETM2 using boron *** carbon emission flux during the ETM2 is at least an order of magnitude smaller than that during the Paleocene–Eocene Thermal Maximum(PETM)(0.015–0.05 Pg C yr^(-1)vs.0.3–1.7 Pg C yr^(-1)).The comparable pre-and post-event carbonate contents suggest the lysocline did not over deepen following the ETM2 at this tropical atlantic site,indicating spatial heterogeneity in the carbonate system due to strong dilution influence from terrestrial weathering and riverine discharge at Site 1258.

关键词： Early Eocene hyperthermals Oceanic carbonate system Stable carbon and oxygen isotopes Earth system modeling tropical atlantic cGENIE

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Seasonal variability of turbulent heat fluxes in the tropical atlantic Ocean based on WHOI flux product

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Acta Oceanologica Sinica 2007年第5期26卷 1-11页

作者： JIANG Hua WANG Hui WU Dexing Institute of Climate System Chinese Academy of Meteorological Sciences Beijing 100081 China Institute of Physical Oceanography Ocean University of China Qingdao 266003 China

The mean seasonal variability of turbulent heat fluxes in the tropical atlantic Ocean is examined using the Woods Hole Oceanographic Institution （WHOI） flux product. The most turbulent heat fluxes occur during winter seasons in the two hemispheres, whose centers are located at 10° -20°N and 5° 15°S respectively. In climatological ITCZ, the turbulent heat fluxes are the greatest from June to August, and in equatorial cold tongue the turbulent heat fluxes are the greatest from March to May. Seasonal variability of sensible heat flux is smaller than that of latent heat flux and mainly is dominated by the variations of air-sea temperature difference. In the region with larger climatological mean wind speed （air-sea humidity difference）, the variations of air-sea humidity difference （wind speed） dominate the variability of latent heat flux. The characteristics of turbulent heat flux yielded from theory analysis and WHOI dataset is consistent in physics which turns out that WHOI＇ s flux data are pretty reliable in the tropical atlantic Ocean.

关键词： turbulent heat fluxes seasonal variation tropical atlantic

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Physical Mechanism of the Impacts of the tropical atlantic Sea Surface Temperature on the Decadal Change of the Summer North atlantic Oscillation

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Atmospheric and Oceanic Science Letters 2013年第5期6卷 365-368页

作者： SUN Jian-Qi Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences

In this study,physical mechanism of the impacts of the tropical atlantic sea surface temperature(SST)on decadal change of the summer North atlantic Oscillation(SNAO)was explored using an atmospheric general circulation model(AGCM)developed at the International Centre for Theoretical Physics(ICTP).The simulation results indicate that the decadal warming of the SST over the tropical atlantic after the late 1970s could have significantly enhanced the convection over the *** enhanced convection would have strengthened the local meridional circulation over the Eastern atlantic-North Africa-Western Europe region,exciting a meridional *** teleconnection might have brought the signal of the tropical atlantic SST to the Extratropics,consequently activating the variability of the eastern part of the SNAO southern center,which led to an eastward shift of the SNAO southern center around the late *** physical processes are highly consistent with the previous observations.

关键词： summer North atlantic Oscillation tropical atlantic sea surface temperature teleconnection decadal change simulation

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Mean Kinematic Characteristics of Synoptic Easterly Disturbances over the atlantic

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Advances in Atmospheric Sciences 2010年第3期27卷 483-499页

作者： Arona DIEDHIOU Luiz A.T.MACHADO Henri LAURENT IRD/LTHE BP 5338041Grenoble Cedex 9France CPTEC/INPE Rod.Pdt.Dutra Cachoeira PaulistaSPBrasil

This study investigates the mean kinematic characteristics of the tropical atlantic easterly disturbances in January-March （JFM）, April-June （AM J）, July-September （JAS） and October-December （OND） from 1968-1998. For each season, the preferential tracks of these disturbances in the 3--10-day band periods were computed and spatialized, as well as their associated wavelength, velocity and main period, which lies between 3-5 days and between 6-9 days depending on the track and the season. Two main tracks are highlighted over the atlantic Ocean. During OND and JFM these two tracks are well separated and located in each hemisphere around 15°S and 12.5°N. From AMJ to JAS these tracks migrate northward; in JAS, they merge into one over the northern tropical atlantic along 17.5°N. The associated wavelength fields exhibit a meridional gradient, with large wavelengths （greater than 4000 km） around the equator, between 5°N and 5°S, and smaller wavelengths outside of this latitude band （between 2500-3500 kin）. The phase speed is also found to exhibit poleward decreasing values from 12-6 m s^-1. Over the north atlantic track, 6-9-day disturbances were found to occur from January to May and approximately from October to December. From June to September, the 3-5-day waves dominate the synoptic activity. Over the south atlantic track, between May and August the synoptic variability is mainly explained by the 3-5-day disturbances but from January to April and from September to December both 3-5-day waves and 6-9-day waves can occur.

关键词： synoptic activity African easterly waves tropical atlantic

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