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GENERAL INFORMATION
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1. Title: Chloroform emissions from coastal Antarctic tundra

2. Author: Wanting Zhang*, Yi Jiao^, Renbin Zhu*, Robert C. Rhew^#, Bowen Sun* and Haitao Dai*

* Anhui Province Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China
^ Department of Geography, University of California Berkeley, Berkeley, California, USA
# Department of Environmental Science, Policy and Management, University of California Berkeley, Berkeley, California, USA

3.  Date of data collection: 2018/11 - 2020/10

4. Geographic location of data collection (where was data collected?): King George Island, Antarctica

5.  Information about funding sources that supported the collection of the data: National Natural Science Foundation of China (No. 41776190; 41976220) and National Key Research and Development Program of China (No. 2020YFA0608501)

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DATA & FILE OVERVIEW
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1. File List
   A. Filename: AntarcticTundraChloroform.xlsx
      Short description: Chloroform fluxes measured from the tundra at King George Island, Antarctica, based upon in situ static chamber measurements and lab-based incubations

2.  Are there multiple versions of the dataset? yes/no
 no

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METHODOLOGICAL INFORMATION
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Chloroform fluxes were measured by static-chamber methods and the concentrations were analyzed by gas chromatography coupled with a mass spectrometry (GC/MS; Agilent 6890N/5973, Agilent Technologies, Santa Clara, CA).  

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DATA-SPECIFIC INFORMATION FOR: [Data_OxfordTract.xlsx]
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Sheet 1 - in situ fluxes

1. Number of variables: 3

2. Number of cases/rows: 6

3. Variable List
    
Column 	label			unit			description
1		Site		           no unit	           site code
2		CHCl3		           nmol m-2 d-1		Chloroform flux
3		SE			nmol m-2 d-1	           standard error of the flux

Sheet 2 - Lab incubation

1. Number of variables: 8

2. Number of cases/rows: 12

3. Variable List
    
Column 	label			unit			description
1		Site			no unit		site number
2		CHCl3		           pmol g-1 d-1		Chloroform flux under 4C toxic conditions
3		SE			pmol g-1 d-1	           standard error of the flux
4		CHCl3		           pmol g-1 d-1		Chloroform flux under 4C anoxic conditions
5		SE			pmol g-1 d-1	           standard error of the flux
6		CHCl3		           pmol g-1 d-1		Chloroform flux under 4C post thermal sterilization
7		SE			pmol g-1 d-1	           standard error of the flux

Sheet 3 - Temperature

1. Number of variables: 9

2. Number of cases/rows: 8

3. Variable List
    
Column 	label			unit			description
1		Site			no unit		site number
2		CHCl3		           pmol g-1 d-1		Chloroform flux under -4C
3		SE			pmol g-1 d-1	           standard error of the flux
4		CHCl3		           pmol g-1 d-1		Chloroform flux under 0C
5		SE			pmol g-1 d-1	           standard error of the flux
6		CHCl3		           pmol g-1 d-1		Chloroform flux under 8C
7		SE			pmol g-1 d-1	           standard error of the flux
8		CHCl3		           pmol g-1 d-1		Chloroform flux under 12C
9		SE			pmol g-1 d-1	           standard error of the flux

Sheet 4 - Freeze-thaw cycles

1. Number of variables: 18

2. Number of cases/rows: 24

3. Variable List
    
Column 	label			unit			description
1		Temperature		degree celsius	incubation temperature
2		Time                         minutes		time of incubation
3		CHCl3		           pmol g-1 d-1		Chloroform flux for site U1
4		SE			pmol g-1 d-1	           standard error of the flux
5		CHCl3		           pmol g-1 d-1		Chloroform flux  for site U2
6		SE			pmol g-1 d-1          	 standard error of the flux
7		CHCl3		           pmol g-1 d-1		Chloroform flux  for site S1
8		SE			pmol g-1 d-1            standard error of the flux
9		CHCl3		           pmol g-1 d-1		Chloroform flux  for site S2
10		SE			pmol g-1 d-1            standard error of the flux
11		CHCl3		           pmol g-1 d-1		Chloroform flux  for site S4
12		SE			pmol g-1 d-1            standard error of the flux
13		CHCl3		           pmol g-1 d-1		Chloroform flux for site P1
14		SE			pmol g-1 d-1	           standard error of the flux
15		CHCl3		           pmol g-1 d-1		Chloroform flux  for site P2
16		SE			pmol g-1 d-1            standard error of the flux
17		CHCl3		           pmol g-1 d-1		Chloroform flux  for site P4
18		SE			pmol g-1 d-1	           standard error of the flux