干旱区生态环境知识资源中心(Arid): Stable Isotopes of Nitrate, Sulfate, and Carbonate in Soils From the Transantarctic Mountains, Antarctica: A Record of Atmospheric Deposition and Chemical Weathering

Arid

DOI	10.3389/feart.2020.00341
	Stable Isotopes of Nitrate, Sulfate, and Carbonate in Soils From the Transantarctic Mountains, Antarctica: A Record of Atmospheric Deposition and Chemical Weathering
	Diaz, Melisa A.; Li, Jianghanyang; Michalski, Greg; Darrah, Thomas H.; Adams, Byron J.; Wall, Diana H.; Hogg, Ian D.; Fierer, Noah; Welch, Susan A.; Gardner, Christopher B.; Lyons, W. Berry
通讯作者	Diaz, MA
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2020
卷号	8
英文摘要	Soils in ice-free areas in Antarctica are recognized for their high salt concentrations and persistent arid conditions. While previous studies have investigated the distribution of salts and potential sources in the McMurdo Dry Valleys, logistical constraints have limited our investigation and understanding of salt dynamics within the Transantarctic Mountains. We focused on the Shackleton Glacier (85 degrees S, 176 degrees W), a major outlet glacier of the East Antarctic Ice Sheet located in the Central Transantarctic Mountains (CTAM), and collected surface soil samples from 10 ice-free areas. Concentrations of water-soluble nitrate (NO3-) and sulfate (SO42-) ranged from <0.2 to similar to 150 mu mol g(-1)and <0.02 to similar to 450 mu mol g(-1), respectively. In general, salt concentrations increased with distance inland and with elevation. However, concentrations also increased with distance from current glacial ice position. To understand the source and formation of these salts, we measured the stable isotopes of dissolved water-soluble NO(3)(-)and SO42-, and soil carbonate (HCO3+ CO3). delta N-15-NO(3)values ranged from -47.8 to 20.4 parts per thousand and, while all Delta O-17-NO(3)values are positive, they ranged from 15.7 to 45.9 parts per thousand. delta S-34-SO(4)and delta O-18-SO(4)values ranged from 12.5 and 17.9 parts per thousand and -14.5 to -7.1 parts per thousand, respectively. Total inorganic carbon isotopes in bulk soil samples ranged from 0.2 to 8.5 parts per thousand for delta C-13 and -38.8 to -9.6 parts per thousand for delta O-18. A simple mixing model indicates that NO(3)(-)is primarily derived from the troposphere (0-70%) and stratosphere (30-100%). SO(4)(2-)is primarily derived from secondary atmospheric sulfate (SAS) by the oxidation of reduced sulfur gases and compounds in the atmosphere by H2O2, carbonyl sulfide (COS), and ozone. Calcite and perhaps nahcolite (NaHCO3) are formed through both slow and rapid freezing and/or the evaporation/sublimation of HCO3+ CO3-rich fluids. Our results indicate that the origins of salts from ice-free areas within the CTAM represent a complex interplay of atmospheric deposition, chemical weathering, and post-depositional processes related to glacial history and persistent arid conditions. These findings have important implications for the use of these salts in deciphering past climate and atmospheric conditions, biological habitat suitability, glacial history, and can possibly aid in our future collective understanding of salt dynamics on Mars.
英文关键词	Antarctica geochemistry salts stable isotopes nitrate sulfate carbonate
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000570444700001
WOS关键词	SHACKLETON GLACIER REGION ; SOUTHERN VICTORIA LAND ; MCMURDO DRY VALLEYS ; AIR-SNOW TRANSFER ; ICE-CORE ; ATACAMA DESERT ; TAYLOR VALLEY ; SULFUR ; SALTS ; OXYGEN
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	Colorado State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326357
作者单位	[Diaz, Melisa A.; Darrah, Thomas H.; Welch, Susan A.; Gardner, Christopher B.; Lyons, W. Berry] Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA; [Diaz, Melisa A.; Welch, Susan A.; Gardner, Christopher B.; Lyons, W. Berry] Ohio State Univ, Byrd Polar & Climate Res Ctr, Columbus, OH 43210 USA; [Li, Jianghanyang; Michalski, Greg] Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA; [Michalski, Greg] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA; [Darrah, Thomas H.] Ohio State Univ, Global Water Inst, Columbus, OH 43210 USA; [Adams, Byron J.] Brigham Young Univ, Dept Biol, Evolutionary Ecol Labs, Provo, UT 84602 USA; [Adams, Byron J.] Brigham Young Univ, Monte L Bean Museum, Provo, UT 84602 USA; [Wall, Diana H.] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA; [Wall, Diana H.] Colorado State Univ, Sch Global Environm Sustainabil, Ft Collins, CO 80523 USA; [Hogg, Ian D.] Polar Knowledge Canada, Canadian High Arctic Res Stn, Cambridge Bay, NU, Canada; [Hogg, Ian D.] ...
推荐引用方式 GB/T 7714	Diaz, Melisa A.,Li, Jianghanyang,Michalski, Greg,et al. Stable Isotopes of Nitrate, Sulfate, and Carbonate in Soils From the Transantarctic Mountains, Antarctica: A Record of Atmospheric Deposition and Chemical Weathering[J]. Colorado State University,2020,8.
APA	Diaz, Melisa A..,Li, Jianghanyang.,Michalski, Greg.,Darrah, Thomas H..,Adams, Byron J..,...&Lyons, W. Berry.(2020).Stable Isotopes of Nitrate, Sulfate, and Carbonate in Soils From the Transantarctic Mountains, Antarctica: A Record of Atmospheric Deposition and Chemical Weathering.FRONTIERS IN EARTH SCIENCE,8.
MLA	Diaz, Melisa A.,et al."Stable Isotopes of Nitrate, Sulfate, and Carbonate in Soils From the Transantarctic Mountains, Antarctica: A Record of Atmospheric Deposition and Chemical Weathering".FRONTIERS IN EARTH SCIENCE 8(2020).