@article {4244, title = {Diurnal chemistry of two contrasting stream types, Taylor Valley, McMurdo Dry Valley Region, Antarctica}, journal = {E3S Web of Conferences}, volume = {98}, year = {2019}, month = {06/2019}, abstract = {

Numerous ephemeral streams flow within the McMurdo Dry Valley Region of Antarctica that transport glacial meltwater to perennially ice-covered, closed-basin lakes during the austral summer. The diurnal behavior for two Taylor Valley streams of different character was examined during the summer of 2010-11. Andersen Creek is a short, 1st-order proglacial stream, whereas Von Guerard Stream is a long, high-order stream with an extensive hyporheic zone that has a substantial cyanobacterial algal mat community in its middle reaches. Both streams display strong daily cycles for temperature, electrical conductivity, dissolved oxygen, and pH. Conductivity varies in concert with flow, with solute dilution occurring during the daily high-flow pulse. Dissolved oxygen co-varies strongly with pH at Andersen Creek but not for Von Guerard Stream. Each stream has a distinct geochemical character that for Andersen Creek is a direct reflection of its glacial source, unmodified by secondary effects, whereas that for Von Guerard Stream is modulated by its resident algal mat community and through extensive hyporheic zone interaction and exchange.

}, keywords = {LTER-MCM}, doi = {10.1051/e3sconf/20199801020}, url = {https://www.e3s-conferences.org/articles/e3sconf/abs/2019/24/e3sconf_wri-162018_01020/e3sconf_wri-162018_01020.html}, author = {Harmon, Mark E. and Leslie, D.L. and W. Berry Lyons and Kathleen A. Welch and Diane M. McKnight}, editor = {Chudaev, O. and Kharaka, Y. and Harmon, R.S. and Millot, R. and Shouakar-Stash, O.} } @article {4105, title = {Dissolved Trace and Minor Elements in Cryoconite Holes and Supraglacial Streams, Canada Glacier, Antarctica}, journal = {Frontiers in Earth Science}, volume = {6}, year = {2018}, month = {04/2018}, abstract = {

We present a synthesis of the trace element chemistry in melt on the surface Canada Glacier, Taylor Valley, McMurdo Dry Valleys (MDV), Antarctica (\∼78{\textopenbullet}S). The MDV is largely ice-free. Low accumulation rates, strong winds, and proximity to the valley floor make these glaciers dusty in comparison to their inland counterparts. This study examines both supraglacial melt streams and cryoconite holes. Supraglacial streams on the lower Canada Glacier have median dissolved (\<0.4\ μm) concentrations of Fe, Mn, As, Cu, and V of 71.5, 75.5, 3.7, 4.6, and 4.3 nM. All dissolved Cd concentrations and the vast majority of Pb values are below our analytical detection (i.e., 0.4 and 0.06 nM). Chemical behavior did not follow similar trends for eastern and western draining waters. Heterogeneity likely reflects distinctions eolian deposition, rock:water ratios, and hydrologic connectivity. Future increases in wind-delivered sediment will likely drive dynamic responses in melt chemistry. For elements above detection limits, dissolved concentrations in glacier surface melt are within an order of magnitude of concentrations observed in proglacial streams (i.e., flowing on the valley floor). The Fe enrichment of cryoconite water relative to N, P, or Si exceeds enrichment observed in marine phytoplankton. This suggests that the glacier surface is an important source of Fe to downstream ecosystems.

}, keywords = {LTER-MCM, Antarctica, cryoconite holes, glacier melt chemistry, supraglacial streams, trace elements}, doi = {10.3389/feart.2018.00031}, url = {http://journal.frontiersin.org/article/10.3389/feart.2018.00031/full}, author = {Sarah Fortner and W. Berry Lyons} } @article {4079, title = {Drivers of solar radiation variability in the McMurdo Dry Valleys, Antarctica}, journal = {Scientific Reports}, volume = {8}, year = {2018}, month = {03/2018}, abstract = {

Annually averaged solar radiation in the McMurdo Dry Valleys, Antarctica has varied by over 20 W m\−2 during the past three decades; however, the drivers of this variability are unknown. Because small differences in radiation are important to water availability and ecosystem functioning in polar deserts, determining the causes are important to predictions of future desert processes. We examine the potential drivers of solar variability and systematically eliminate all but stratospheric sulfur dioxide. We argue that increases in stratospheric sulfur dioxide increase stratospheric aerosol optical depth\ and decrease solar intensity. Because of the polar location of the McMurdo Dry Valleys (77\–78\°S) and relatively long solar ray path through the stratosphere, terrestrial solar intensity is sensitive to small differences in stratospheric transmissivity. Important sources of sulfur dioxide include natural (wildfires and volcanic eruptions) and anthropogenic emission.

}, keywords = {LTER-MCM}, doi = {10.1038/s41598-018-23390-7}, url = {http://www.nature.com/articles/s41598-018-23390-7.pdf}, author = {Maciek K. Obryk and Andrew G Fountain and Peter T. Doran and W. Berry Lyons and Eastman, R.} } @article {4022, title = {Decadal ecosystem response to an anomalous melt season in a polar desert in Antarctica}, journal = {Nature Ecology \& Evolution}, volume = {1}, year = {2017}, month = {09/2017}, pages = {1334-1338}, keywords = {LTER-MCM}, doi = {10.1038/s41559-017-0253-0}, url = {https://www.nature.com/articles/s41559-017-0253-0}, author = {Michael N. Gooseff and John E. Barrett and Byron Adams and Peter T. Doran and Andrew G Fountain and W. Berry Lyons and Diane M. McKnight and John C. Priscu and Eric R. Sokol and Cristina D. Takacs-Vesbach and Martijn L. Vandegehuchte and Ross A. Virginia and Diana H. Wall} } @article {1082, title = {Do Cryoconite Holes have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate Ecosystems of Taylor Valley, Antarctica?}, journal = {Arctic, Antarctic, and Alpine Research}, volume = {45}, year = {2013}, month = {11/2013}, pages = {440 - 454}, keywords = {LTER-MCM}, doi = {10.1657/1938-4246-45.4.440}, author = {Bagshaw, Elizabeth and Martyn Tranter and Andrew G Fountain and Kathleen A. Welch and Hassan J. Basagic and W. Berry Lyons} } @article {1294, title = {Dating water and solute additions to ice-covered Antarctic lakes}, journal = {Geochimica et Cosmochimica Acta}, volume = {69}, year = {2005}, pages = {A720}, keywords = {LTER-MCM}, author = {W. Berry Lyons and Carolyn Dowling and Kathleen A. Welch and Snyder, G and Robert J. Poreda and Peter T. Doran and Andrew G Fountain} } @article {1328, title = {The distribution of microplankton in the McMurdo dry valley lakes, Antarctica: Response to ecosystem legacy or present-day climate controls?}, journal = {Polar Biology}, volume = {27}, year = {2004}, pages = {238-249}, keywords = {LTER-MCM}, doi = {LTER}, author = {Emily C. Roberts and John C. Priscu and Craig F. Wolf and W. Berry Lyons and Johanna Laybourn-Parry} } @article {1448, title = {Dating quaternary lacustrine sediments in the McMurdo Dry Valleys Antarctica}, journal = {Palaeography, Palaeoclimatology, Palaeoecology}, volume = {147}, year = {1999}, month = {03/1999}, pages = {223-239}, type = {Journal}, keywords = {LTER-MCM, sediments}, doi = {10.1016/S0031-0182(98)00159-X}, author = {Peter T. Doran and G. W. Berger and W. Berry Lyons and Robert A. Wharton Jr. and M. L. Davisson and J. Southon and J. E. Dibb} } @inbook {1552, title = {Determination of rare earth elements in Antarctic lakes and streams of varying ionic strengths}, booktitle = {Plasma Source Mass Spectrometry: Developments and Applications}, year = {1997}, pages = {253-262}, publisher = {Royal Society of Chemistry}, organization = {Royal Society of Chemistry}, address = {London}, keywords = {LTER-MCM}, author = {Graham, E and Ramsey, L. A. and W. Berry Lyons and Kathleen A. Welch} } @article {1569, title = {Determination of major element chemistry in terrestrial waters from Antarctica by ion chromatography}, journal = {Journal of Chromatography A}, volume = {739}, year = {1996}, pages = {257-263}, keywords = {LTER-MCM}, author = {Kathleen A. Welch and W. Berry Lyons and Graham, E and Klaus Neumann and James M. Thomas and D. Mikesell} }