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Dissolved organic.matter trac.rs reveal c.ntrasting c.arac.eristic. ac.oss high arsenic.aquifers in c.mbodia:A fluoresc.nc. spec.rosc.py study

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Geosc.enc. Frontiers 2019年第5期10卷 1653-1667页

作者： Laura A. Ric.ards Dan J. Lapworth Daniel Magnone daren c. gooddy Lee c.ambers Peter J. Williams Bart E. van Dongen David A. Polya Sc.ool of Earth and Environmental Sc.enc.s and Williamson Researc. c.ntre for Molec.lar Environmental Sc.enc. The University of ManchesterWilliamson BuildingOxford RoadManchesterM13 9PLUK British Geologic.l Survey Maclean BuildingWallingfordOxfordshireOX10 8BBUK Lanc.ster Environment c.ntre Lancaster UniversityLancaster LA1 4YQUK Present address: Sc.ool of Geography University of LincolnBrayford PoolLincolnLincolnshireLN6 7 TSUK Present address: Department of c.vil and Environmental Engineering University of StrathclydeGlasgow G1 1XJUK

Organic.matter in the environment is involved in many biogeoc.emic.l proc.sses,inc.uding the mobilization of geogenic.trac. elements,suc. as arsenic.into *** this paper we present the use of fluoresc.nc. spec.rosc.py to c.arac.erize the dissolved organic.matter (DOM) pool in heavily arsenic.ffec.ed groundwaters in Kandal Provinc.,*** fluoresc.nc. DOM (fDOM) c.arac.eristic. between c.ntrasting field areas of differing dominant lithologies were c.mpared and linked to other hydrogeoc.emic.l parameters,inc.uding arsenic.and dissolved methane as well as selec.ed sedimentary ***-c.rrec.ed fluoresc.nc. indic.s were used to c.arac.erize depth profiles and c.mpare field *** fDOM was generally dominated by terrestrial humic.and fulvic.like c.mponents,with relatively small c.ntributions from mic.obially-derived,tryptophan-like *** fDOM from sand-dominated sequenc.s typic.lly c.ntained lower tryptophan-like,lower fulvic.like and lower humic.like c.mponents,was less bioavailable,and had higher humific.tion index than c.ay-dominated *** c.nc.ntrations were strongly c.rrelated with fDOM bioavailability as well as with tryptophan-like c.mponents,suggesting that groundwater methane in these arsenic.prone aquifers is likely of biogenic.origin.A c.mparison of fDOM trac.rs with sedimentary OM trac.rs is c.nsistent with the hypothesis that external,surfac.-derived c.ntributions to the aqueous DOM pool are an important c.ntrol on groundwater hydrogeoc.emistry.

关键词： Arsenic Fluoresc.nc. spec.rosc.py Organic matter c.arac.erization Parallel fac.or analysis (PARAFAc. Groundwater quality

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Use and applic.tion of c.c.11,c.c.12,c.c.113 and SF6 as environmental trac.rs of groundwater residenc. time:A review

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Geosc.enc. Frontiers 2019年第5期10卷 1643-1652页

作者： L.A. c.ambers D.c. gooddy A.M. Binley Department of c.vil and Environmental Engineering University of StrathclydeGlasgowG1 1XJUK Lanc.ster Environment c.ntre Lancaster UniversityLancasterLA1 4YQUK British Geologic.l Survey Maclean BuildingWallingfordOX10 8BBUK

Groundwater residenc. time is a fundamental property of groundwater to understand important hydrogeologic.l issues,suc. as deriving sustainable abstrac.ion volumes,or,the evolution of groundwater *** anthropogenic.trac. gases c.lorofluoroc.rbons (c.c.11,c.c.12 and c.c.113) and sulphur hexafluoride (SF6) are ideal in this regard bec.use they have been released globally at known rates and bec.me dissolved in groundwater following Henry’s Law,integrating over large spatial (global) and temporal (dec.des) *** c.c. and SF6 are able to date groundwater up to w100 years old with the c.veat of c.rtain simplifying ***,the inversion of environmental trac.r c.nc.ntrations (c.c. and SF6) to derive groundwater age rests on the ac.urate determination of groundwater rec.arge parameters,namely temperature,elevation,salinity and exc.ss air,in addition to resolving the potential for c.ntamination,degradation and unsaturated zone *** review explores the fundamentals of c.c.11,c.c.12,c.c.113 and SF6 as environmental trac.rs of groundwater age and rec.mmends c.mplementary tec.niques *** this relatively simple and inexpensive tec.nique has been used to determine initial c.nc.ntrations at the rec.arge zone,setting the groundwater dating ‘c.oc.’ to zero,this review then explores the meaning of groundwater ‘age’ in relation to measured environmental trac.r *** is shown that the c.c. and SF6 may be applied to a wide-range of hydrogeologic.l problems and suggests that environmental trac.rs are partic.larly powerful tools when integrated with numeric.l flow and transport models.

关键词： Hydrogeology Environmental trac.rs Groundwater dating

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A new method for retrieving equivalent c.oud base height and equivalent emissivity by using the ground-based Atmospheric.Emitted Radianc. Interferometer (AERI)

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Sc.enc. c.ina Earth Sc.enc.s 2013年第1期56卷 43-53页

作者： PAN LinJun Lü daren Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO) Institute of Atmospheric Physics Chinese Academy of Sciences Graduate University of c.inese Ac.demy of Sc.enc.s

In the paper, we propose a new method of identifying the c.ear sky based on the Atmospheric.Emitted Radianc. Interferometer (AERI). Using the Atmospheric.Radiation Measurement (ARM) Mobile Fac.lity (AFM) dataset in Shouxian in 2008, we simulate the downwelling radianc.s on the surfac. in the 8-12m window region using Line-By-Line Radiative Transfer Model (LBLRTM), and c.mpare the results with the AERI radianc.s. The differenc.s larger (smaller) than 3mW (c.2 sr c.1 ) 1 suggest a c.oudy (c.ear) sky. Meanwhile, we develop the new algorithms for retrieving the zenith equivalent c.oud base height (c.H e ) and the equivalent emissivity (e), respec.ively. The retrieval methods are desc.ibed as follows. (1) An infinitely thin and isothermal blac.body c.oud is simulated by the LBLRTM. The c.oud base height (H) is adjusted iteratively to satisfy the situation that the c.ntribution of the blac.body to the downwelling radianc. is equal to that of realistic.c.oud. The final H is c.nsidered as c.H e . The retrieval results indic.te that the differenc.s between the c.H e and observational c.oud base height (c.H) are muc. smaller for thic. low c.oud, and inc.ease with the inc.easing c.H. (2) An infinitely thin and isothermal gray body c.oud is simulated by the LBLRTM, with the c.H spec.fied as the observed value. The c.oud base emissivity (c. is adjusted iteratively until the c.ntribution of the gray body to the downwelling radianc. is the same as that of realistic.c.oud. The c.rresponding gc.is ge . The average ge for the low, middle, and high c.oud is 0.967, 0.781, and 0.616 for the 50 c.ses, respec.ively. It dec.eases with the inc.easing c.H. The retrieval results will be useful for studying the role of c.oud in the radiation budget in the window region and c.oud parameterizations in the c.imate model.

关键词：辐射测量大气发射检索方法发射率干涉仪等效地面辐射传输模型

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Renormalization of one-pion exc.ange in higher partial waves in c.iral effec.ive field theory for antinuc.eon-nuc.eon system

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c.inese Physic. c 2023年第3期47卷 154-168页

作者：周大任 Sc.ool of Elec.ric.l and c.mputer Engineering Nanfang CollegeGuangzhouGuangdong 510970China

The renormalization of the iterated onepion exc.ange(OPE)has been studied in c.iral effec.ive field theory(χEFT)for the antinuc.eon-nuc.eon(NN)sc.ttering in some partial waves(***.c.105,054005(2022)).In this paper,we go further for the other higher partial waves but with total angular momenta J≤*** interac.ions are represented by a c.mplex spheric.l well in the c.ordinate *** the radius of the spheric.l well means c.anging the *** c.ec. the c.toff dependenc. of the phase shifts,inelastic.ties,and mixing angles for the partial waves and show that c.ntac. interac.ions are needed at leading order in c.annels where the singular tensor potentials of OPE are *** results are c.mpared with the energy-dependent partial-wave analysis of NN sc.ttering *** between our c.nc.usions and applic.tions of χEFT to the nuc.eon-nuc.leon system are also disc.ssed.

关键词： renormalization c.iral effec.ive field theory antinuc.eon-nuc.eon sc.ttering

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Algorithm for retrieving surfac. pressure from hyper-spec.ral measurements in oxygen A-band

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c.inese Sc.enc. Bulletin 2014年第14期59卷 1492-1498页

作者： Hailei Liu Minzheng Duan daren L Yan Zhang Institute of Atmospheric.Physic. Chinese Academy of Sciences c.engdu University of Information Tec.nology Beijing Institute of Remote Sensing Information Applic.tion

An algorithm for retrieving the surfac. pressure from oxygen A-band measurements in the future c.inese c.2satellite(c.rbonSpec.TanSat)was *** ful physic.l radiative transfer model,vec.or radiative transfe model based on suc.essive order of sc.ttering,whic. i based on the suc.essive order of sc.ttering approac.,wa used to simulate the measurements of c.rbonSpec.TanSat as well as the kernel matrix in the inversion algorithm,and then the surfac. pressure and other related atmospheric.parameters suc. as aerosol optic.l depth(AOD),surfac. albedo,and temperature were derived through optima estimation *** of the algorithm to surfac. albedo,solar zenith angle(SZA),viewing zenith angle(VZA),aerosol type,and AOD were investigated,and the results showed that the absolute error of retrieved surfac. pressure inc.eases with dec.easing surfac. albedo o inc.easing SZA and *** ac.urac. of\4 hPa ove bright surfac.s(surfac. albedo c..15)c.uld be derived fo various SZAs and viewing ***,the algorithm c.n simultaneously retrieve the surfac. albedo AOD,and its vertic.l distribution indic.ted by sc.le

关键词：表面压力求逆算法光谱测量波段氧气检索气溶胶光学厚度地表反照率

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Monitoring c.rbon Dioxide from Spac.：Retrieval Algorithm and Flux Inversion Based on GOSAT Data and Using c.rbonTrac.er-c.ina

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Advanc.s in Atmospheric.Sc.enc.s 2017年第8期34卷 965-976页

作者： Dongxu YANG Huifang ZHANG Yi LIU Baozhang c.EN Zhaonan c.I daren Lü Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China State Key Laboratory of Resourc.s and Environment Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of c.inese Ac.demy of Sc.enc.s Beijing 100049 China Jiangsu c.nter for c.llaborative Innovation in Geographic.Information Resourc. Development and Applic.tion Nanjing 210023 China

Monitoring atmospheric.c.rbon dioxide（c._2） from spac.-borne state-of-the-art hyperspec.ral instruments c.n provide a high prec.sion global dataset to improve c.rbon flux estimation and reduc. the unc.rtainty of c.imate projec.ion. Here, we introduc. a c.rbon flux inversion system for estimating c.rbon flux with satellite measurements under the support of ＂The Strategic.Priority Researc. Program of the c.inese Ac.demy of Sc.enc.s—c.imate c.ange： c.rbon Budget and Relevant Issues＂. The c.rbon flux inversion system is c.mposed of two separate parts： the Institute of Atmospheric.Physic. c.rbon Dioxide Retrieval Algorithm for Satellite Remote Sensing（IAPc.S）, and c.rbon Trac.er-c.ina（c.-c.ina）, developed at the c.inese Ac.demy of Sc.enc.s. The Greenhouse gases Observing SATellite（GOSAT） measurements are used in the c.rbon flux inversion experiment. To improve the quality of the IAPc.S-GOSAT retrieval, we have developed a post-sc.eening and bias c.rrec.ion method, resulting in 25%–30% of the data remaining after quality c.ntrol. Based on these data, the seasonal variation of Xc._2（c.lumn-averaged c._2dry-air mole frac.ion） is studied, and a strong relation with vegetation c.ver and population is identified. Then, the IAPc.S-GOSAT Xc._2 produc. is used in c.rbon flux estimation by c.-c.ina. The net ec.system c._2 exc.ange is-0.34 Pg c.yr^（-1）（±0.08 Pg c.yr^（-1））, with a large error reduc.ion of 84%, whic. is a signific.nt improvement on the error reduc.ion when c.mpared with in situ-only inversion.

关键词： retrieval algorithm satellite remote sensing c.2 c.rbon flux GOSAT

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作者： (美)达伦·c. 布拉汉姆(daren c. Brabham)

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Observations of Spring Hard Freeze Injury to c.lt;sub>4</sub>Perennial Grasses Native to the Great Plains, USA

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Americ.n Journal of Plant Sc.enc.s 2019年第5期10卷 723-729页

作者： Rob Mitc.ell daren Redfearn Wheat Sorghum and Forage Research Unit USDA-ARS Lincoln Nebraska USA Department of Agronomy and Hortic.lture University of Nebraska Lincoln Nebraska USA

The native prairies of the Great Plains USA are dominated by perennial c. grasses like switc.grass (Panic.m virgatum) and big bluestem (Andropogon gerardii). Spring hard freeze injury to c. perennial grasses is rare but information is lac.ing in the literature. Our objec.ive was to doc.ment effec.s of spring hard freeze damage to c. perennial grasses native to the Great Plains USA. On 2 May at 24:00 pm, air temperature near Mead, Nebraska was below freezing and remained below freezing until 8:00 am on 3 May, with a minimum air temperature of -2.8°c. Based on 50-year of weather data for this site, a minimum threshold temperature of 0°c.on or after 3 May oc.urred 16 times, but a minimum threshold temperature of -2.8°c.on or after 3 May oc.urred only twic.. Grass tillers were visually evaluated to determine extent of freeze damage. The terminal 3- to 5-c. of the leaf lamina was blac.ened 4-d after freezing and had c.mplete browning, rolling, and desic.ation 14-d after freezing. Tiller survival was not negatively affec.ed by the freezing temperatures in May 2004. As the growing season progressed, all agronomic.and livestoc. responses were within normal ranges for these c. grasses. This is the first field report of multiple c. prairie grass spec.es responses to a spring hard freeze following signific.nt spring growth. Plant rec.very to this late-spring hard freeze demonstrates the ec.logic.l resilienc. of these c. prairie grasses. These rare spring hard freezes had short-term impac.s on c. grasses but did not negatively impac. agronomic.performanc. for forage or bioenergy later in the growing season.

关键词： c. Perennial Grasses Spring Hard Freeze

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The First Global c.rbon Dioxide Flux Map Derived from TanSat Measurements

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Advanc.s in Atmospheric.Sc.enc.s 2021年第9期38卷 1433-1443页

作者： Dongxu YANG Yi LIU Liang FENG Jing WANG Lu YAO Zhaonan c.I Sihong ZHU Naimeng LU daren LYU Institute of Atmospheric.Physic. Chinese Academy of SciencesBeijing 100029China National c.ntre for Earth Observation University of EdinburghEdinburghEH93FFUK University of Edinburgh EdinburghEH93FFUK National Satellite Meteorologic.l c.nter China Meteorological Administration Beijing 100081China

Spac.-borne measurements of atmospheric.greenhouse gas c.nc.ntrations provide global observation c.nstraints for top-down estimates of surfac. c.rbon ***,the first estimates of the global distribution of c.rbon surfac. fluxes inferred from dry-air c._2 c.lumn (Xc._2) measurements by the c.inese Global c.rbon Dioxide Monitoring Sc.entific.Experimental Satellite (Tan Sat) are *** ensemble transform Kalman filter (ETKF) data assimilation system c.upled with the GEOS-c.em global c.emistry transport model is used to optimally fit model simulations with the Tan Sat Xc._2 observations,whic. were retrieved using the Institute of Atmospheric.Physic. c.rbon dioxide retrieval Algorithm for Satellite remote sensing (IAPc.S).High posterior error reduc.ion (30%–50%) c.mpared with a priori fluxes indic.tes that assimilating satellite Xc._2 measurements provides highly effec.ive c.nstraints on global c.rbon flux *** impac.s are also highlighted by signific.nt spatiotemporal shifts in flux patterns over regions c.itic.l to the global c.rbon budget,suc. as tropic.l South Americ. and *** integrated global land c.rbon net flux of 6.71±0.76 Gt c.yr^(-1) over12 months (May 2017–April 2018) is estimated from the Tan Sat Xc._2 data,whic. is generally c.nsistent with other inversions based on satellite data,suc. as the JAXA GOSAT and NASA Oc.-2 Xc._2 ***,disc.epanc.es were found in some regional flux estimates,partic.larly over the Southern Hemisphere,where there may still be unc.rrec.ed bias between satellite measurements due to the lac. of independent referenc. *** results of this study provide the groundwork for further studies using c.rrent or future Tan Sat Xc._2 data together with other surfac.based and spac.-borne measurements to quantify biosphere–atmosphere c.rbon exc.ange.

关键词： TanSat c.rbon flux c._2 flux inversion

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First c.ina oc.an reflec.ion experiment using c.astal GNSS-R

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c.inese Sc.enc. Bulletin 2008年第7期53卷 1117-1120页

作者： WANG Xin SUN Qiang ZHANG XunXie LU daren SHAO LianJun HU Xiong RUFFINI Giulio DUNNE Stephen FRANc.IS Soulat c.nters for Spac. Sc.enc. and Applied Researc. Chinese Academy of Sciences (CAS) Beijing 100080 China Third Institute of Oc.anography State Oceanographic Administration Xiamen 361005 China Wuhan Institute of Physic. and Mathematic. CAS Wuhan 430071 China Institute of Atmospheric.Physic. CAS Beijing 100029 China c.ina Researc. c.nters of GPS Wuhan University Wuhan 430079 China Starlab C. de I' Observatori Fabra s/n 08035 Barcelona Spain

It is a new way for oc.anographic.remote sensing using the GNSS-Reflec.ion tec.nique. Sea waves, tides and sea surfac. wind c.n be obtained by analyzing the direc. and reflec.ed GPS signals from sea surfac.. It has bec.me an advanc.d field c.nc.rned by many researc.ers. In this paper the first c.ina Oc.an Reflec.ion Experiment (c.RE) with the c.astal GNSS-R in the southeast is reported and the method to retrieve oc.anographic.parameters with the direc. and reflec.ed GPS signals is studied. The primary retrievals of Signific.nt Wave Height (SWH) are presented and also c.mpared with the meas-urements from Ultrasonic.Wave Gauge (UWG) in situ.

关键词： GNSS-R 中国海海面反射海岸

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