Prochlorococcus is the dominant population of the autotrophs in the oceanic area in theSouth China Sea; and contributes significantly to picoplanktonic (【2μm) carbon biomass. However, thereis no availabe data on its...Prochlorococcus is the dominant population of the autotrophs in the oceanic area in theSouth China Sea; and contributes significantly to picoplanktonic (【2μm) carbon biomass. However, thereis no availabe data on its growth the and productivity so far. In the present study, the in situ populationgrowth rate of Prochlorococus at the chlorophyll maximum layer at 6 .3°N, 110°E in the South China展开更多
Iron (FeCl<sub>3</sub>) enrichment experiment was carried out at 6. 3°N, 110°E in the SouthChina Sea. Cell abundances of the main groups of picoplankton Synechococcus, Prochlorococcus, picoeu-k...Iron (FeCl<sub>3</sub>) enrichment experiment was carried out at 6. 3°N, 110°E in the SouthChina Sea. Cell abundances of the main groups of picoplankton Synechococcus, Prochlorococcus, picoeu-karyote and heterotrophic bacteria were traced during the experiment by flow cytometry (FCM). Resultsshowed that picoplankton responded rapidly to iron of nano mole concentration. However, high concentra-展开更多
Membrane potential is essential for the uptake of substance and physiological activityin cells; and is an indicator of cell viability and a criterion of aquatic environment. It is also applied toclassification of ecol...Membrane potential is essential for the uptake of substance and physiological activityin cells; and is an indicator of cell viability and a criterion of aquatic environment. It is also applied toclassification of ecological populations. So membrane potential is a key parameter in studies on aquaticmicroplankton. It can be estimated by microelectrode, radioisotope method, spectro photomeny, flow cy-展开更多
Distribution of one group of marine viral particles along the Kuroshio Current and theadjacent area was investigated in June, 1998 using flow cytometry for the first time. The position of thisgroup of virioplankton in...Distribution of one group of marine viral particles along the Kuroshio Current and theadjacent area was investigated in June, 1998 using flow cytometry for the first time. The position of thisgroup of virioplankton in flow cytometry plots coincided with the position of the V-I group reported byMarie et al. (1999). Abundances of this group of virioplankton in the surface water ranged from 3.4×10<sup>5</sup> to 2. 3×10<sup>6</sup> ml<sup>-1</sup> in the investigated area. High abundance occurred in the shelf water and low abun-展开更多
Currently, modeling studies tend to significantly underestimate observed space-based glyoxal (CHOCHO) vertical column densities (VCDs), implying the existence of missing sources of giyoxal. Several recent studies ...Currently, modeling studies tend to significantly underestimate observed space-based glyoxal (CHOCHO) vertical column densities (VCDs), implying the existence of missing sources of giyoxal. Several recent studies suggest that the emissions of aromatic compounds and molar yields of glyoxal in the chemical mechanisms may both be underestimated, which can affect the simulated glyoxal concentrations. In this study, the influences of these two factors on glyoxal amounts over China were investigated using the RAMS-CMAQ modeling system for January and July 2014. Four sensitivity simulations were performed, and the results were compared to satellite observations. These results demonstrated significant impacts on glyoxal concentrations from these two factors. In case 1, where the emissions of aromatic compounds were increased three-fold, improvements to glyoxal VCDs were seen in high anthropogenic emissions regions. In case 2, where molar yields of glyoxal from isoprene were increased five-fold, the resulted concentrations in July were B-B-fold higher, achieving closer agreement between the modeled and measured glyoxal VCDs. The combined changes from both cases 1 and 2 were applied in case B, and the model succeeded in further reducing the underestimations of glyoxal VCDs. However, the results over most of the regions with pronounced anthropogenic emissions were still underestimated. So the molar yields of giyoxal from anthropogenic precursors were considered in case 4. With these additional mole yield changes (a two-fold increase), the improved concentrations agreed better with the measurements in regions of the lower reaches of the Yangtze River and Yellow River in January but not in July.展开更多
基金This study was supported by the 973 Project No.G2000078500,863 Project No.2001AA630509-2,NSFC Project No.4O232021,30170189 and 4017603
文摘Prochlorococcus is the dominant population of the autotrophs in the oceanic area in theSouth China Sea; and contributes significantly to picoplanktonic (【2μm) carbon biomass. However, thereis no availabe data on its growth the and productivity so far. In the present study, the in situ populationgrowth rate of Prochlorococus at the chlorophyll maximum layer at 6 .3°N, 110°E in the South China
基金This study was supported by the 973 Project No.G2000087500,NSFC Project No.40232021,30170189 and 40176037
文摘Iron (FeCl<sub>3</sub>) enrichment experiment was carried out at 6. 3°N, 110°E in the SouthChina Sea. Cell abundances of the main groups of picoplankton Synechococcus, Prochlorococcus, picoeu-karyote and heterotrophic bacteria were traced during the experiment by flow cytometry (FCM). Resultsshowed that picoplankton responded rapidly to iron of nano mole concentration. However, high concentra-
基金This study was supported by 863 project No.2001AA630509-2 and NSFC project(No.30170189,40176037),and NKBRSF project 2001CB409700 and G2000078500
文摘Membrane potential is essential for the uptake of substance and physiological activityin cells; and is an indicator of cell viability and a criterion of aquatic environment. It is also applied toclassification of ecological populations. So membrane potential is a key parameter in studies on aquaticmicroplankton. It can be estimated by microelectrode, radioisotope method, spectro photomeny, flow cy-
基金This study was supported by the 863 project No.2001AA630509-2,NSFC project No.40232021,30170189 and 4017603
文摘Distribution of one group of marine viral particles along the Kuroshio Current and theadjacent area was investigated in June, 1998 using flow cytometry for the first time. The position of thisgroup of virioplankton in flow cytometry plots coincided with the position of the V-I group reported byMarie et al. (1999). Abundances of this group of virioplankton in the surface water ranged from 3.4×10<sup>5</sup> to 2. 3×10<sup>6</sup> ml<sup>-1</sup> in the investigated area. High abundance occurred in the shelf water and low abun-
基金supported by the National Natural Science Foundation of China (No. 91544221)the National Key R&D Programs of China (Nos. 2017YFC0209803, 2017YFC0210000)the CAS Strategic Priority Research Program Grant (No. XDB05020000)
文摘Currently, modeling studies tend to significantly underestimate observed space-based glyoxal (CHOCHO) vertical column densities (VCDs), implying the existence of missing sources of giyoxal. Several recent studies suggest that the emissions of aromatic compounds and molar yields of glyoxal in the chemical mechanisms may both be underestimated, which can affect the simulated glyoxal concentrations. In this study, the influences of these two factors on glyoxal amounts over China were investigated using the RAMS-CMAQ modeling system for January and July 2014. Four sensitivity simulations were performed, and the results were compared to satellite observations. These results demonstrated significant impacts on glyoxal concentrations from these two factors. In case 1, where the emissions of aromatic compounds were increased three-fold, improvements to glyoxal VCDs were seen in high anthropogenic emissions regions. In case 2, where molar yields of glyoxal from isoprene were increased five-fold, the resulted concentrations in July were B-B-fold higher, achieving closer agreement between the modeled and measured glyoxal VCDs. The combined changes from both cases 1 and 2 were applied in case B, and the model succeeded in further reducing the underestimations of glyoxal VCDs. However, the results over most of the regions with pronounced anthropogenic emissions were still underestimated. So the molar yields of giyoxal from anthropogenic precursors were considered in case 4. With these additional mole yield changes (a two-fold increase), the improved concentrations agreed better with the measurements in regions of the lower reaches of the Yangtze River and Yellow River in January but not in July.