@article {4160, title = {Transit times and rapid chemical equilibrium explain chemostasis in glacial meltwater streams in the McMurdo Dry Valleys, Antarctica}, journal = {Geophysical Research Letters}, volume = {45}, year = {2018}, month = {12/2018}, pages = {13322 - 13331}, abstract = {

Fluid\  transit\  time\  is\  understood\  to\  be\  an\  important\  control\  on\  the\  shape\  of concentration-discharge (C-q) relationships, yet empirical evidence supporting this linkage is limited. We investigated C-q relationships for weathering-derived solutes across seven Antarctic glacial meltwate streams. We hypothesized that (H1) solute fluxes in McMurdo Dry Valley streams are reaction limited so that C-q\ relationships are characterized by dilution and that (H2) transit time explains between-stream variability in the degree of C-q dilution. Results show that C-q relationships are chemostatic because solute equilibrium times are shorter than stream corridor fluid transit times. Between-stream variability in the efficiency of solute production is positively correlated with transit time, suggesting that transit time is an important control on the solute export regime. These results provide empirical evidence for the controls on weathering-derived C-q relationships and have important implications for Antarctic ecosystems and solute export regimes of watersheds worldwide.

}, keywords = {LTER-MCM}, doi = {10.1029/2018GL080369}, url = {https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GL080369}, author = {Wlostowski, Adam and Michael N. Gooseff and Diane M. McKnight and W. Berry Lyons} } @article {4026, title = {A temporal stable isotopic (δ18O, δD, d-excess) comparison in glacier meltwater streams, Taylor Valley, Antarctica}, journal = {Hydrological Processes}, volume = {31}, year = {2017}, month = {08/2017}, pages = {3069 - 3083}, abstract = {

In this paper, we describe the importance of hyporheic dynamics within Andersen Creek and Von Guerard Stream, Taylor Valley, Antarctica, from the 2010\–2011 melt season using natural tracers. Water collection started at flow onset and continued, with weekly hyporheic-zone sampling. The water δ18O and δD values were isotopically lighter in the beginning and heavier later in the season. D-excess measurements were used as an indicator of mixing because an evaporative signature was evident and distinguishable between 2 primary end-members (glacier meltwater and hyporheic zone). Hyporheic-zone influence on the channel water was variable with a strong control on streamwater chemistry, except at highest discharges. This work supports previous research indicating that Von Guerard Stream has a large, widespread hyporheic zone that varies in size with time and discharge. Andersen Creek, with a smaller hyporheic zone, displayed hyporheic-zone solute interaction through the influence from subsurface hypersaline flow. Overall, the evolution of Taylor Valley hyporheic-zone hydrology is described seasonally. In mid-December, the hyporheic zone is a dynamic system exchanging with the glacier meltwater in the channel, and with diminishing flow in January, the hyporheic zone drains back into the channel flow also impacting stream chemistry. This work adds new information on the role of hyporheic zone\–stream interaction in these glacier meltwater streams.\ 

}, keywords = {LTER-MCM}, doi = {10.1002/hyp.v31.1710.1002/hyp.11245}, url = {http://onlinelibrary.wiley.com/doi/10.1002/hyp.11245/full}, author = {Leslie, D.L. and Kathleen A. Welch and W. Berry Lyons} } @article {1124, title = {Taylor{\textquoteright}s {\textquoteleft}missing{\textquoteright} lake: Integrating history into LTER research in the McMurdo Dry Valley}, volume = {2013}, year = {2012}, publisher = {LTER News}, address = {Albuquerque}, keywords = {LTER-MCM}, url = {http://news.lternet.edu/Article2568.html}, author = {Khan, A and Howkins, Adrian and W. Berry Lyons} } @proceedings {1251, title = {Trends in discharge and flow season timing of the Onyx River, Wright Valley, Antarctica since 1969}, journal = {Antarctica; A keystone in a changing world--online proceedings for the tenth international symposium}, year = {2007}, publisher = {U.S. Geological Survey Open-File Report 2007-1047}, keywords = {LTER-MCM}, doi = {LTER}, author = {Michael N. Gooseff and Diane M. McKnight and Peter T. Doran and W. Berry Lyons}, editor = {Alan Cooper and Carol Raymond and ISAES Editorial Team} } @article {1278, title = {Terrestrial ecosystem processes of Victoria Land, Antarctica}, journal = {Soil Biology and Biochemistry}, volume = {38}, year = {2006}, pages = {3019-3034}, keywords = {LTER-MCM}, doi = {LTER}, author = {John E. Barrett and Johnson N. Nkem and Sletten, R and Steltzer, H and Diana H. Wall and Wallenstein, M and Ross A. Virginia and D. W. Hopkins and Aislabie, J and Bargagli, R and Bockheim, J and Campbell, I and W. Berry Lyons and Daryl L. Moorhead} }