检索结果-南通市图书馆

Chinese Journal of Oceanology and Limnology 2015年第3期33卷 741-747页

作者：何建华余雯林武辉门武陈立奇 College of Oceanography and Environment Science Xiamen University Third Institute of Oceanography State Oceanic Administration key lab of global change and marine-atmospheric chemistry State Oceanic Administration key lab of global change and marine- atmospheric chemistry State Oceanic Administration Department of Engineering Physics Tsinghua University

Fluxes of particulate organic carbon （POC） were derived from ^210Po/^210Pb disequilibrium during the 4th Chinese National Arctic Research Expedition （CHINARE-4） from July 1 to September 28, 2010. Average residence times of particulate ^210Po in the euphotic zone were -16.00 a to 1.54 a, which are higher than those of dissolved ^210^Po （-6.89 a to -0.70 a）. Great excesses of dissolved ^210Po were observed at all stations, with an average 210^Po/^210^Pb ratio of 1.91±0.20, resulting from 210^Pb atmospheric deposition after sea ice melt. POC fluxes from the euphoric zone were estimated by two methods （E and B） in the irreversible scavenging model. Estimated POC fluxes were 945-126 mmol C/（m^2·a）and 1 848-109 mmol C/（m^2·a） by methods E and B, respectively, both decreasing from low to high latitude. The results are comparable to previous works for the same region, indicating efficient biological pumping in the Chukchi Sea. The results can improve understanding of the carbon cycle in the western Arctic Ocean.

关键词： particulate organic carbon (POC) flux ^210Po/^210Pb disequilibrium Chukchi Shelf

Equilibrator-based measurements of dissolved methane in the surface ocean using an integrated cavity output laser absorption spectrometer

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2015年第6期34卷 34-41页

作者： LI Yuhong ZHAN Liyang ZHANG Jiexia CHEN Liqi key laboratory of global change and marine-atmospheric chemistry State Oceanic Administration Third Institute of Oceanography State Oceanic Administration

A new off-axis integrated cavity output spectroscopy （ICOS） is coupled to Weiss equilibrator for continuous high- resolution dissolved methane measurement in the surface ocean. The time constant for the equilibrator in freshwater at room temperature is determined via dis-equilibration and re-equilibration experiments. The constant for methane is about 40 min. The system is calibrated using a standard gas of 3.980×10-6, and the precision of the ICOS for methane is 0.07%. This system is equipped onboard to measure the spatial distribution in methane concentrations of South Yellow Sea （SYS） along the cruise track from Shanghai to Qingdao. Result shows that the methane concentration varies from 2.79 to 36.36 nmol/L, reveals a significant pattern of methane source in SYS, and a distinct decreasing trend from south to north. The peak value occurs at the coast area outside mouth of the Changjiang River, likely to be affected by the Changjiang diluted water mass dissolving a large amount of rich in methane. Moreover, all the surface waters are oversaturated, air-to-sea fluxes range from 98.59 to 5 485.35 μmol/（m2·d）（average value （1 169.74±1 398.46） μmol/（m2·d））, indicating a source region for methane to the atmosphere. key words： methane, equilibrator, off-axis integrated cavity output spectroscopy （ICOS）, South Yellow Sea

关键词： methane equilibrator off-axis integrated cavity output spectroscopy (ICOS) South Yellow Sea

Effect of air masses motion on the rapid change of aerosols in marine atmosphere

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第9期31卷 217-228页

作者： Jinpei Yan Qi Lin Miming Zhang Shuhui Zhao Liqi Chen Third Institute of Oceanography Ministry of Natural Resources Xiamen 361005 China key laboratory of global change and marine-atmospheric chemistry Xiamen 361005 China

The impact of air masses motion on marine aerosol properties was investigated using an on-board single particle mass spectrometer(SPAMS) deployed for the determination of single particle size resolved chemical composition over Southeast China Sea. Two aerosol blooms(E1 and E2) were observed during the cruise. High average particle number count occurred in E1(7320), followed by E2(5850), which was more than 100–150 times of the average particle number count during normal periods. Particles were classified as four major sources, including continental source, shipping source, marine source, and transport source based on the mass spectral similarity. Transport source was identified as those particles with high particle number count occurred only during aerosol bloom period. Three sub-types of EC-Ca, OC-Ca, and Al-rich were classified as transport ***-Ca was the dominant particles of the transport source, accounting for more than 70%of the total particles in aerosol bloom events. A uni-modal size distribution in the size range of 0.1–2.0 μm was observed during normal period, while a bimodal distribution with a tiny mode(<0.3 μm) and a coarse mode between 0.4 and 0.6 μm was present during aerosol bloom. The variation of aerosol source is consistent with air masses back trajectories, for the reason that most of the long-range air trajectories are from the ocean,while short air trajectories originate in the continental regions, which means that air masses have a significant impact on the aerosol physical–chemical properties along their tracks.

关键词： marine aerosol Chemical composition Source apportionment Air masses Single particle aerosol mass spectrometer(SPAMS)

chemistry of Aerosols over Chukchi Sea and Bering Sea

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2004年第1期23卷 26-36页

作者：朱赖民陈立奇杨绪林杜俊民张远辉 The Third Institute of Oceanography Key Laboratory of Global Change and Marine-Atmospheric Chemistry SOA Xiamen 361005 China

The contents of elements in aerosols sampled during the First Chinese Arctic Research Expedition (CHINARE-1) show great differences from one element to another. Na, K, Ca, Mg, Al, F, and Cl are the major components in the aerosols, whose contents are larger than 30 ng/m+3. The chemical elements whose contents vary between {0.1}-30 ng/m+3 are Br, Sr, Cr, Ni, and Zn. The chemical elements whose contents are close to or slightly higher than {0.1} ng/m+3 are Rb, Ba, Zr, Th, and Pb. The contents of As, Sb, W, Mo, Au, La, Ce, Nd, Sm, Eu, Tb, Yb, Lu, Sc, Co, Hf, Ta, and Cd are less than {0.1} ng/m+3. The mass concentration data for the same element, as observed during CHINARE-1, are almost accordant, but much lower than what is observed in the China’s seas or the coasts of China. The enrichment factor and electron microscopic analyses and lead isotope tracing were used to distinguish their sources. Four groups of sources can be classified as follows: anthropogenic: As, Sb, W, F, Mo, Au, Cu, Pb, Cd, V; crustal: La, Ce, Nd, Sm, Eu, Tb, Yb, Lu, Fe, Sc, Cr, Co, Ba, Zr, Hf, Ta, Cs, Mn, Th, U; oceanic:Na, K, Ca, and Mg; and mixing: Rb, Sr, Ca, and Mg.

关键词：气溶胶化学元素化合作用楚克其海

How Well do Existing Indices Measure the Strength of the East Asian Winter Monsoon?

在线全文

学校读者我要写书评

暂无评论

Advances in atmospheric Sciences 2010年第4期27卷 855-870页

作者：王林陈文 Center for Monsoon System research Institute of Atmospheric PhysicsChinese Academy of Sciences key laboratory of global change and marine-atmospheric chemistry State Oceanic Administration

Defining the intensity of the East Asian winter monsoon （EAWM） with a simple index has been a difficult task. This paper elaborates on the meanings of 18 existing EAWM strength indices and classifies them into four categories： low level wind indices, upper zonal wind shear indices, east-west pressure contrast indices, and East Asian trough indices. The temporal/spatial performance and prediction potential of these indices are then analyzed for the 1957-2001 period. It reveals that on the decadal timescale, most indices except the east-west pressure contrast indices can well capture the continuous weakening of the EAWM around 1986. On the interannual timescale, the low level wind indices and East Asian trough indices have the best predictability based on knowledge of the El Nio-Southern Oscillation and Arctic Oscillation, respectively. All the 18 existing indices can well describe the EAWM-related circulation, precipitation, and lower tropospheric air temperature anomalies. However, the variations of surface air temperature over large areas of central China cannot be well captured by most indices, which is possibly related to topographic effects. The results of this study may provide a possible reference for future studies of the EAWM.

关键词： East Asian winter monsoon index interannual variation interdecadal variation

Pollutants identification of ambient aerosols by two types of aerosol mass spectrometers over southeast coastal area, China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第2期30卷 252-263页

作者： Jinpei Yan Liqi Chen Qi Lin Shuhui Zhao Lei Li key laboratory of global change and marine-atmospheric chemistry Third Institute of Oceanography SOA Xiamen 361005 China Institute of atmospheric Environment Safety and Pollution Control Jinan University Ouangzhou 510632 China

Two different aerosol mass spectrometers, Aerodyne Aerosol Mass Spectrometer（AMS） and Single Particle Aerosol Mass Spectrometer（SPAMS） were deployed to identify the aerosol pollutants over Xiamen, representing the coastal urban area. Five obvious processes were classified during the whole observation period. Organics and sulfate were the dominant components in ambient aerosols over Xiamen. Most of the particles were in the size range of 0.2–1.0 μm, accounting for over 97% of the total particles measured by both ***, as well as sulfate, measured by AMS were in good correlation with measured by SPAMS. However, high concentration of NH4＋was obtained by AMS, while extremely low value of NH4＋was detected by SPAMS. Contrarily, high particle number counts of NO3-and Clwere given by SPAMS while low concentrations of NO3-and Cl-were measured by AMS. The variations of POA and SOA obtained from SPAMS during event 1 and event 2 were in accordance with the analysis of HOA and OOA given by AMS, suggesting that both of AMS and SPAMS can well identify the organic clusters of aerosol particles. Overestimate or underestimate of the aerosol sources and acidity would be present in some circumstances when the measurement results were used to analyze the aerosol properties, because of the detection loss of some species for both instruments.

关键词： Aerosol Size distribution Chemical composition Aerosol mass spectrometer Aerosol source

Distributions and air-sea fluxes of CO_2 in the summer Bering Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2014年第6期33卷 1-8页

作者： CHEN Liqi GAO Zhongyong SUN Heng CHEN Baoshan CAI Wei-jun key laboratory of global change and marine-atmospheric chemistry of State Oceanic Administration Third Institute of OceanographyState Oceanic Administration Department of marine Sciences University of Georgia

The 3rd Chinese National Arctic Research Expedition （CHINARE-Arctic III） was carried out from July to September in 2008. The partial pressure of CO2 （pCO2） in the atmosphere and in surface seawater were determined in the Bering Sea during luly 11-27, 2008, and a large number of seawater samples were taken for total alkalinity （TA） and total dissolved inorganic carbon （DIC） analysis. The distributions of CO2 parameters in the Bering Sea and their controlling factors were discussed. The pCO2 values in surface seawater presented a drastic variation from 148 to 563 laatm （1 μatm = 1.013 25× 10-1Pa）. The lowest pCOz values were observed near the Bering Sea shelf break while the highest pCO2 existed at the western Bering Strait. The Bering Sea generally acts as a net sink for atmospheric CO2 in summer. The air-sea CO2 fluxes in the Bering Sea shelf, slope, and basin were estimated at -9.4, -16.3, and -5.1 mmol/（m2.d）, respectively. The annual uptake of CO2 was about 34 Tg C in the Bering Sea.

关键词： partial pressure of CO2 CO2 system air-sea CO2 flux Bering Sea

^(234)Th-derived particulate organic carbon export flux in the western Arctic Ocean

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2010年第6期28卷 1146-1151页

作者：余雯陈立奇程建平何建华尹明端曾志 key laboratory of global change and marine-atmospheric chemistry Department of Engineering Physics Tsinghua University key laboratory of Particle & Radiation Imaging (Tsinghua University) Ministry of Education

To evaluate the particle dynamics and estimate the POC (particulate organic carbon) export flux from the euphotic zone in the western Arctic Ocean,234 Th238 U disequilibrium was applied during the second Chinese National Arctic Research Expedition (July 15-September 26,2003).The POC export fluxes are estimated from the measured profiles of the 234 Th/238 U activity ratios and the POC/PTh *** average residence times of the particulate and dissolved 234 Th in the euphotic zone are 33 d and 121 d,and their average export fluxes are 480 dpm/m 2 d and 760 dpm/m 2 d,*** scavenging and removal processes of particle reactive elements are active in the upper layer of the Chukchi *** average residence time of 234 Th increases from shelf to basin,while the export fluxes of 234 Th *** estimated POC export fluxes from the euphotic zone vary from 2.1 to 20.3 mmol/m 2 d,indicating that the western Arctic Ocean is an important carbon sink in summer due to efficient biological pump.

关键词： POC export flux 234Th/238U disequilibrium carbon cycling western Arctic Ocean

Interdecadal Variability in Large and Small Warm Pools in Western Pacific and Their Association with Rainfall Anomalies

在线全文

学校读者我要写书评

暂无评论

atmospheric and Oceanic Science Letters 2014年第1期7卷 56-61页

作者： ZHOU Lian-Tong Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of Sciences key laboratory of global change and marine-atmospheric chemistry

This study investigated interdecadal variability of June–October(JJASO) the large and small warm pools in western Pacific and their association with rainfall anomalies using station and reanalysis data from 1958 to *** results indicated that the large and small warm pools in western Pacific showed an interdecadal shift around *** large warm pool years over western Pacific were found after 1986,whereas the small warm pool years were often seen throughout the periods before *** analysis results also showed that there were obvious interdecadal variability in JJASO rainfall in Southeast China and warm pool in western *** 1958–1985(small warm pool years),the decrease in rainfall was associated with tropospheric moisture divergence and sinking motion over Southeast China and warm pool in western ***,during 1986–2008(large warm pool years),the increase in rainfall was associated with tropospheric moisture convergence and ascending *** analysis showed that large warm pool contributed to the increase in surface latent heat fluxes over warm pool in the western ***,there was an increase in the amount of water vapor over Southeast China and warm pool in western Pacific,which contributed to increased rainfall in these regions.

关键词： large and small warm pools interdecadal variability surface latent heat flux

Spatial variability of summertime aragonite saturation states and its influencing factor in the Bering Sea

在线全文

学校读者我要写书评

暂无评论

Advances in Climate change Research 2021年第4期12卷 508-516页

作者： SUN Heng GAO Zhong-Yong ZHAO De-Rong SUN Xiu-Wu CHEN Li-Qi key laboratory of global change and marine-atmospheric chemistry(GCMAC)of Ministry of Natural Resources(MNR) Third Institute of Oceanography(TIO)MNRXiamen361005China

The Bering sea is susceptible to ocean acidification driven by both human activities(anthropogenic CO_(2))and distinctive natural *** assess the situation of ocean acidification,we investigated the spatial variability of aragonite saturation states(ΩAr)in July 2010 during the 4th Chinese National Arctic Research Expedition(CHINARE).The surface waters were all oversaturated with respect to aragonite(ΩAr>1)due to high biological removal,andΩAr ranged from 1.43 to *** relatively lowΩAr values were found in the western Bering Strait and eastern nearshore region of the Bering Sea Shelf,which were associated with the upwelling and riverine input,*** the subsurface,theΩAr decreased to generally low saturation states and were observed to be strongly undersaturated(ΩArchange and increasing anthropogenic CO_(2)absorption,the suppression and undersaturation ofΩAr in the Bering Sea are not only attributed to the natural processes but also the accumulation of anthropogenic CO_(2).

关键词： Bering sea Ocean acidification Aragonite saturation states Spatial variability Controls