The sampling depth in meters below surface. For unusual sampling events when multiple samples were taken within one depthgroup (e.g. middle) the sampling depth and corresponding sample values were averaged.
This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-1440297, NTL LTER. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.