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Yu W.,Key Laboratory of Global Change and Marine Atmospheric Chemistry | Yu W.,Tsinghua University | Chen L.,Key Laboratory of Global Change and Marine Atmospheric Chemistry | Cheng J.,Tsinghua University | And 3 more authors.
Chinese Journal of Oceanology and Limnology | Year: 2010

To evaluate the particle dynamics and estimate the POC (particulate organic carbon) export flux from the euphotic zone in the western Arctic Ocean, 234Th-238U 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 234Th/238U activity ratios and the POC/PTh ratios. The average residence times of the particulate and dissolved 234Th in the euphotic zone are 33 d and 121 d, and their average export fluxes are 480 dpm/m2d and 760 dpm/m2d, respectively. The scavenging and removal processes of particle reactive elements are active in the upper layer of the Chukchi Sea. The average residence time of 234Th increases from shelf to basin, while the export fluxes of 234Th decrease. The estimated POC export fluxes from the euphotic zone vary from 2.1 to 20.3 mmol/m2d, indicating that the western Arctic Ocean is an important carbon sink in summer due to efficient biological pump. © 2010 Chinese Society for Oceanology and Limnology, Science Press and Springer Berlin Heidelberg.


Lin Q.,Key Laboratory of Global Change and Marine Atmospheric Chemistry | Lin Q.,Third Institute of Oceanography | Lin H.M.,Key Laboratory of Global Change and Marine Atmospheric Chemistry | Lin H.M.,Third Institute of Oceanography | And 6 more authors.
Science China Chemistry | Year: 2013

In this work, we reported a simultaneous determination approach for Pb(II), Cd(II) and Zn(II) at μg L-1 concentration levels using differential pulse stripping voltammetry on a bismuth film electrode (BiFE). The BiFE could be prepared in situ when the sample solution contained a suitable amount of Bi(NO)3, and its analytical performance was evaluated for the simultaneous determination of Pb(II), Cd(II) and Zn(II) in solutions. The determination limits were found to be 0.19 μg L-1 for Zn(II), and 0.28 μg L-1 for Pb(II) and Cd(II), with a preconcentration time of 300 s. The BiFE approach was successfully applied to determine Pb(II), Cd(II) and Zn(II) in tea leaf and infusion samples, and the results were in agreement with those obtained using an atomic absorption spectrometry approach. Without Hg usage, the in situ preparation for BiFE supplied a green and acceptability sensitive method for the determination of the heavy metal ions. © Science China Press and Springer-Verlag Berlin Heidelberg 2013.


Wen L.,CAS Institute of Atmospheric Physics | Wen L.,Chengdu Electric Power Bureau | Yin X.,CAS Institute of Atmospheric Physics | Yin X.,University of Chinese Academy of Sciences | And 2 more authors.
Atmospheric Science Letters | Year: 2016

This study investigated the spring thermal difference between western and eastern China and its association with the rainfall anomalies using station and reanalysis data from 1960 to 2006. The spring thermal difference between western and eastern China underwent an obvious interdecadal shift around 1979. The thermal difference between western and eastern China was small during 1960-1978, which strengthened the southwesterly wind anomalies in line with the thermal wind. This enhanced the East Asian summer monsoon. In addition, the increase in rainfall over North China and decrease in rainfall over the Yangtze River were associated with the strong East Asian summer monsoon. However, during 1979-2006, the thermal difference between western and eastern China was large, which strengthened the northeasterly wind anomalies in line with the thermal wind. This supports the notion of weakened East Asian summer monsoon associated with the decrease in rainfall over North China and increase in rainfall over the Yangtze River. © 2016 Royal Meteorological Society.


Wang L.,CAS Institute of Atmospheric Physics | Wang L.,Key Laboratory of Global Change and Marine Atmospheric Chemistry | Huang R.,CAS Institute of Atmospheric Physics | Wu R.,CAS Institute of Atmospheric Physics
Atmospheric Science Letters | Year: 2016

In boreal winter during the period 1958-2013, more than two third of tropical cyclone (TC) genesis over the South China Sea (SCS) is found to occur in specific atmospheric environmental fields associated with four types of East Asian winter monsoon circulation which are named the monsoon gyre (MG), the easterly, the reverse-oriented monsoon trough (RMT), and the monsoon confluence (MC), respectively. The first two types account for about 80% of TC geneses. Before TC formation over the SCS, lower-level positive relative vorticity and humidity anomalies are accompanied by mid-troposphere ascent and upper-level divergence anomalies, which are favorable for TC genesis. These anomalies are the most significant in the MG type. Moreover, the eddy kinetic energy (EKE) growth from the barotropic energy conversion contributes beneficially to the evolving of incipient disturbances to a TC over the SCS. In all four types, the meridional wind convergence and the zonal wind shear play an important role in the EKE growth. © 2016 Royal Meteorological Society.

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