Auxiliary Material Submission for Paper 2011GL043301

Perennial ponds are not an important source of water or dissolved organic matter to groundwaters with high arsenic concentrations in West Bengal, India

Saugata Datta and Andrew W. Neal
Department of Geology, Kansas State University, Manhattan, Kansas, USA

T. Jade Mohajerin
Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana, USA

Troy Ocheltree
Division of Biology, Kansas State University, Manhattan, Kansas, USA

Brad E. Rosenheim
Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana, USA

Christopher D. White
Department of Petroleum Engineering, Louisiana State University, Baton Rouge, Louisiana, USA

Karen H. Johannesson
Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana, USA

Datta, S., A. W. Neal, T. J. Mohajerin, T. Ocheltree, B. E. Rosenheim, C. D. White, and K. H. Johannesson (2011), Perennial ponds are not an important source of water or dissolved organic matter to groundwaters with high arsenic concentrations in West Bengal, India, Geophys. Res. Lett., 38, L20404, doi:10.1029/2011GL049301.

Introduction

This file provides additional description of methods of sample collection, sample analysis, statistical analysis, and the reactive transport model used to simulate dissolved organic matter (DOM) transport in groundwaters from the Murshidabad district of West Bengal, India.

1. 2011gl043301-txts01.doc
Text of methods, statistical tests, reactive transport model, field site, table, figures, and references in a combined file.


2. 2011gl043301-ts01.txt 
Stable isotope values (delta-18 O and delta-3 H) for groundwaters and surfaces waters from Murshidabad, West Bengal, India. It comprises the following tab-separated columns:
1: The source or type of sample. "Tubewell" indicates domestic use, e.g., cooking and drinking. "Irrigation" is a well used to water crops. "River" samples come from rivers, and "Pond" from ponds.
2: Block in the Indian cartography. May be "none".
3: Subarea; irrigation wells are "east" or "west" of the Bhagirathi River. May be"none" for other cases.
4: Sample identifier. tw = tubewell, rw = river water, iw and irw = irrigation water, pw = pond water, bm indicates the Beldanga block, hk indicates the Hariharpara block, jb indicates the Jalangi block, na indicates the Naodo block,  nb designates the Nabagram block, and khn is the Kandi block. Numbers are used to provide unique labels.
5: deltaO18 value.
6: deltaH3 value.
7: Sample depth in meters, -999.25 indicates missing value.
8: Date in format yy-Mmm, either 9-Jun or 10-Jan.



3. 2011gl043301-fs01.jpg 
Maps showing locations of tubewells, irrigation wells, pond, and river sampling locations for the various blocks visited within the Murshidabad district of West Bengal, India. 

4. 2011gl043301-fs02.jpg 
Highly schematic, cartoon cross-section along a west to east transect in the Murshidabad study area. Cross-section is not to scale, and thus the scale-bars depicted on the left side of the cross-section are only approximate. Stratigraphy is based on preliminary sediment coring in the study site (Neal et al., 2010). The Holocene surficialsilty-clays appear to generally thicken from west to east, and at each site, fine to medium sand underlies the surficial silty-clays (Neal et al., in prep.). Examples of tubewells are shown schematically as vertical blue lines.

5. 2011gl043301-fs03.jpg 
Results of the reactive transport model using a DOM concentration of 0.5 mmol kg-1.