Jiangsu Key Laboratory of Meteorological Disaster

Nanjing, China

Jiangsu Key Laboratory of Meteorological Disaster

Nanjing, China

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Zheng Y.-F.,Jiangsu Key Laboratory of Meteorological Disaster | Zheng Y.-F.,Nanjing University of Information Science and Technology | Zhang J.-E.,Nanjing University of Information Science and Technology | Wu R.-J.,Nanjing University of Information Science and Technology | And 6 more authors.
Huanjing Kexue/Environmental Science | Year: 2011

Experiments were conducted under open-top-chambers conditions to assess the photosynthetic responses of wheat plants (Triticum aestivum L., YangMai16) to supplemental UV-B radiation (10%-10.9% higher then control group, T1) and enhanced ozone [(100±9) nmol·mol-1, T2], separately and in combination (combination treatment, T3), making use of LCpro+ Portable Photosynthesis System and DIVING-PAM Fluorometer to determine gas exchange and chlorophyll fluorescence parameters. Results indicated that Pn, Gs, Tr, Pm and Ik of T1, T2 and T3 treatments decreased significantly compared to CK (control group, natural air and UV-B radiant intensity condition), while there were no differences between T3 and T1 or T2 or both in major growth stages. UV-B fiercely inhibited the stomatal conductance and transpiration of plants, while T1 stimulated stomata opening and transpiration in jointing stage. Dark respiration (Rd) of T1 was increased, while no significance difference was found between T2 and CK or T3 and CK in most stages. T1 and T2 reduced Fv/Fm value only in booting stage, while T3 was significant lower than CK except jointing stage. qP value declined significantly in treatments of T1, T2 and T3 as Compared to CK, with decreasing amplitude occurring in the order T3>T1>T2. NPQ, Y(NPQ), Y(NO) value of T1, T2 and T3 treatments increased significantly compared to CK, with maximum increasing amplitude occurring in the order T3>T1>T2, of which NPQ of T1 and T2 turned to decrease since filling stage, and T3 turned to decrease since flowering stage to a greater degree than T1 and T2. T1, T2 and T3 also caused significance reduction in Y(II), with reducing amplitude occurring in the order T3>T1>T2. Obviously, supplemental UV-B radiation and enhanced ozone caused a significant decrease in gas exchange capacity, maximum photochemical capacity and photosynthetic activity of winter wheat, and the photoprotective mechanism was damage, leading to greater proportion of excitation energy dissipated in the form of non-regulated heat and fluorescence. The photosystems of winter wheat were damaged by both excess energy and UV-B or excess energy and O3, or excess energy, UV-B and O3together. UV-B and O3 in combination enhanced the negative effects on photo-protective mechanisms and excitation energy distribution in PSII compared to UV-B or O3 alone, while the interactive effects were less than addition.


Zheng Y.,Jiangsu Key Laboratory of Meteorological Disaster | Zheng Y.,Nanjing University of Information Science and Technology | Fan J.,Jiangsu Key Laboratory of Meteorological Disaster | Fan J.,Nanjing University of Information Science and Technology | And 3 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2013

Direct, diffuse and net solar radiation was measured at a site in the Taihu region from May 2008 to April 2009 using a multi-filter rotating shadow band radiometer. Based on the Mie theory of spherical particles, the aerosol particle size distribution was retrieved and analyzed. Diurnal cycles of the aerosol optical depth (AOD) and the aerosol particle size distribution differed from weekdays to weekends due to human activities. More fine particles were generated from 06:00-09:00 (local time) on weekdays than during the same period on weekends. The annually averaged AOD at 500 nm was 0.8038±0.7924 with a maximum value of 0.9359±0.7389 in the summer and a minimum value of 0.6209±0.5500 in the winter. The aerosol particle size distribution was bimodal with a fine-mode peak at 0.15 μm and a coarse-mode peak at 3 μm. Fine-mode particles dominated over the area in the summer and autumn, while coarse-mode particles dominated over in winter. Variations in AOD and aerosol particle size distribution were significantly influenced by weather patterns. Aerosol loading was greatly diminished by precipitation washout and the subsequent build-up in aerosol loading depended on the aerosol size. The rate of increase of submicron aerosol particles was greater than that of coarse-mode aerosols.


Wu R.-J.,Jiangsu Key Laboratory of Meteorological Disaster | Wu R.-J.,Nanjing University of Information Science and Technology | Zheng Y.-F.,Jiangsu Key Laboratory of Meteorological Disaster | Zheng Y.-F.,Nanjing University of Information Science and Technology | And 6 more authors.
Journal of Natural Disasters | Year: 2010

Based on daily high temperature and lower temperature data for Nanjing, Shanghai and Hangzhou stations at Yangtze River Delta, strong high - temperature process and the occurrence of extreme high temperature were analyzed and described, by normal statistics approaches and Mann - Kendal test. The interannual and seasonal variations of occurrence of extreme maximum temperatures above 35 °C at three cities were analyzed; meanwhile, the relationships between occurrence of selected maximum temperature ( ≥32°C and ≥38° ) and the mean summer temperature was discussed. These results would give a reference to research of numerical simulation and the development of early warning and forecasting of heat wave.


Zhang T.,Chongqing Climate Center | Sun Z.,Jiangsu Key Laboratory of Meteorological Disaster
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

Based on the data of SST and NCEP/NCAR reanalysis data, the relationship is analyzed of spring SSTA in the Kuroshio region with summer precipitation in China, summer 500 hPa field and water vapor transport, using the methods of Morlet wave, correlation and composite analysis. The results show that annual and interdecadal change of spring SST in the Kuroshio region is distinct. Spring SST displays a significantly increasing trend and there exist different periodic oscillations in the Kuroshio region, with the 23-year periodic oscillation being the most obvious. Troughs and ridges in the mid- and higher-latitudes turn deeper in high Kuroshio SSTA years. At the same time, the western Pacific subtropical high strengthens and stretches westwards. As a result, the warm / wet air from the west of the subtropical high locates in the mid- and lower-reaches of the Yangtze River and south China and summer rainfall in the above regions increases accordingly. Composite anomalous water vapor flux fields indicate that the vapor transport from the South China Sea and western Pacific and the vapor from the north converge over the mid- and lower-reaches of the Yangtze River and south China, which results in the increase of the summer rainfall in the mid- and lower-reaches of the Yangtze River and south China. On the contrary, the summer rainfall in the mid-and lower-reaches of the Yangtze River and south China decreases correspondingly in low Kuroshio SSTA years. © 2011 IEEE.


Zhang J.E.,Meteorological Research Institute of Jiangxi Province | Xiao H.,Agro meteorological Experiment Station of Jiangxi Province | Zheng Y.F.,Jiangsu Key Laboratory of Meteorological Disaster | Wu R.J.,Jiangsu Key Laboratory of Meteorological Disaster | And 2 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2015

The open-top chamber (OTC) is an important device used to study the impact of climate change on ecosystems. These chambers have been widely used in climate change simulation and pollution ecology research. Compared to the conventional closed artificial climate chamber or the newly developed free-air concentration enrichment (FACE) method, the OTC creates a microclimate that is more similar to the atmospheric environment. Moreover, its test gas concentration control is more precise, and its construction and operating costs are lower. Our research results indicated that microclimatic elements inside and outside the OTC are different. Although much research has been carried out on microclimatic elements inside and outside the OTC, and improvements have been made based on these research results, there are only a few reports on the growth and photosynthetic response of plants to these microclimatic differences. This study aimed to evaluate the photosynthetic response of winter wheat (Triticum aestivum L.) grown inside (T1) and outside (T2) an OTC, using the plants of a modern cultivar, ‘YangMai16.’ Gas exchange, photosynthetic pigment content, and chlorophyll fluorescence parameters were evaluated. The test field was located at the Agricultural Meteorological Experiment Station of Nanjing University of Information Science and Technology, China (32º 03′ N, 118º51′ E). The seeds were sown on November 5, 2009, by drilling, with a seeding rate of 220.5 kg/hm2, and plants were harvested on May 31, 2010. The daily mean temperature and relative humidity inside the OTC used in our experiments were 8.9% and 3.3% higher, respectively, than those of the atmospheric environment; however, total radiation was 20.4% lower. The differences in microclimatic elements inside and outside the OTC used in this study were similar to those recorded by other groups.Our results indicated that the net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), max photo-synthetic rate (Pm), and half-saturation light intensity (Ik) of T1 were significantly higher than those of T2 (P<0.05). Before the filling stage, the apparent quantum yield (AQY) of T1 was significantly higher than that of T2, whereas transpiration rate (Tr) and dark respiratory rate (Rd) were significantly lower (P < 0.05). After the filling stage, the results reversed. The chlorophyll and carotenoid contents of T1 were significantly higher than those of T2 during most of the growth stages P < 0.05). The basic fluorescence yield (Fo) and dark-adapted maximum fluorescence yield (Fm) values of T1 were higher than those of T2, but there was no difference in the maximum photochemical capacity of PSII (photosystem II) (Fv / Fm) between T1 and T2 during most of the growth stages. In the booting and flowering stages, the photochemical quenching coefficient (qP) of T1 was significantly lower than that of T2 (P<0.05). There was no difference in the quantum yield of photochemical energy conversion in PSII [Y(II)]of T1 and T2 during most of the growth stages. The non-photochemical quenching coefficient (NPQ) and quantum yield of regulated non-photochemical energy loss in PSII [Y(NPQ) ] of T1 were significantly higher than those of T2 after the filling stage (P <0.05), whereas the quantum yield of non-regulated non-photochemical energy loss in PSII [Y(NO) ] was lower. Our results indicate that the gas exchange capability, light response capability, and photosynthetic pigment content of winter wheat grown inside the OTC were higher than those of wheat grown outside. There were no differences in the maximum photochemical capacity and quantum yield of photochemical energy conversion in the PSII of winter wheat grown inside and outside the OTC. In contrast, the fraction of energy dissipated as heat via the regulated photo-protective NPQ mechanism was higher, while the fraction that was passively dissipated in the form of heat and fluorescence was lower, for winter wheat grown inside the OTC. Photo-protection of the photosynthetic apparatus from excess energy in PSII was also better in the winter wheat grown inside the OTC. Our results are expected to help improve OTCs, including the evaluation of data from controversial ecology projects and the application of research knowledge obtained from OTCs to field conditions. © 2015, Ecological Society of China. All rights reserved.


Ding Z.,Jiangsu Key Laboratory of Meteorological Disaster | Gao Y.,Jiangsu Key Laboratory of Meteorological Disaster
2011 International Conference on Information Science and Technology, ICIST 2011 | Year: 2011

Using the U.S. National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis data at 1°×1° resolution and WRF meso-scale model, the thesis carries out numerical simulations of the three tropical cyclones process, which occurred in August, 2009. The result indicates that the movement of typhoon Morakot is related with the interaction of typhoon Morakot with typhoon Goni and the typhoon Etau around the time of landfall. The result of the sensitivity experiments show that according to the principle of angular momentum conservation, when the radial of the monsoon depression changes, the typhoon's wind speed of the part which is close to the of the monsoon low will increase, which in turn changes the typhoon track. In the presence of two typhoons, when the radial of the monsoon low decreases, the north wind becomes stronger preventing typhoon to the west of the monsoon low from moving towards north. Due to the increased south wind, the eastern part of typhoon can not move northward, and the typhoon intensity is increasing. This is verified by the results of the computation control experiment and the sensitivity experiments of the steering flow at the deep level. Therefore, when there are more than one typhoon occurred at the same time, the changes of the monsoon low should be considered. © 2011 IEEE.


Sun L.,Jiangsu Key Laboratory of Meteorological Disaster | Yin Y.,Jiangsu Key Laboratory of Meteorological Disaster
2010 2nd IITA International Conference on Geoscience and Remote Sensing, IITA-GRS 2010 | Year: 2010

Based on precipitation trend map of 597 stations in China, this paper selected 96 stations where precipitation reduced significantly through 90% significance test during 1960-2009, and studied its variation characteristics mainly using Mann-Kendall test. The results show that annual precipitation in 96 stations show a apparent downward tendency which is in the magnitude order of 103. The mutation time of precipitation is determined as 1979. The aunnal precipition amount of spring and autumn are smaller than summer, and winter is the least. Except winter, another three seasons have decrease trend, especially summer. During fifty years, whatever total precipitation amounts or precipitation days, moderate rain and under (0.1mm-10mm)show a upward trend, while moderate rain and over(>10mm)show a decline trend. © 2010 IEEE.

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