02186nas a2200313   4500008004100000022001400041245009000055210006900145260001200214300001800226490000700244520123000251653002201481653002401503653002001527653001701547653001501564100002201579700002101601700002101622700002201643700002201665700002401687700002101711700002501732700002101757700002501778856006901803       2024                        eng d  a2328-427700aResponse of a terrestrial polar ecosystem to the March 2022 Antarctic weather anomaly0 aResponse of a terrestrial polar ecosystem to the March 2022 Anta  c08/2024  ae2023EF0043060 v123 a<p>Record high temperatures were documented in the McMurdo Dry Valleys, Antarctica, on 18 March 2022, exceeding average temperatures for that day by nearly 30&deg;C. Satellite imagery and stream gage measurements indicate that surface wetting coincided with this warming more than 2 months after peak summer thaw and likely exceeded thresholds for rehydration and activation of resident organisms that typically survive the cold and dry conditions of the polar fall in a freeze-dried state. This weather event is notable in both the timing and magnitude of the warming and wetting when temperatures exceeded 0&deg;C at a time when biological communities and streams have typically entered a persistent frozen state. Such events may be a harbinger of future climate conditions characterized by warmer temperatures and greater thaw in this region of Antarctica, which could influence the distribution, activity, and abundance of sentinel taxa. Here we describe the ecosystem responses to this weather anomaly reporting on meteorological and hydrological measurements across the region and on later biological observations from Canada Stream, one of the most diverse and productive ecosystems within the McMurdo Dry Valleys.</p>10aatmospheric river10aclimate variability10aextreme weather10apolar desert10asoil biota1 aBarrett, John, E.1 aAdams, Byron, J.1 aDoran, Peter, T.1 aDugan, Hilary, A.1 aMyers, Krista, F.1 aSalvatore, Mark, R.1 aPower, Sarah, N.1 aSnyder, Meredith, D.1 aWright, Anna, T.1 aGooseff, Michael, N.  uhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023EF00430601993nas a2200253   4500008004100000022001400041245010200055210006900157260001200226300001100238490000700249520122000256653001501476653000901491653002401500653002201524653001701546653002301563100002501586700002401611700002101635700002101656856006201677       2022                        eng d  a0885-608700aLong-term stream hydrology and meteorology of a polar desert, the McMurdo Dry Valleys, Antarctica0 aLongterm stream hydrology and meteorology of a polar desert the   c06/2022  ae146230 v363 a<p>The McMurdo Dry Valleys (MDVs; 77.50&deg;S, 162.25&deg;E) make up the largest ice-free region of Antarctica at 3500 km<sup>2</sup>. Their position near the coast of the Ross Sea provides for a milder climate than much of the rest of the continent. Alpine and piedmont glaciers in the MDVs melt during the austral summer providing water to down gradient streams and terminal lakes on valley floors. There are currently 14 meteorological stations and 17 stream gauges operating across the MDVs, some with continuous records that go back to 1969. This relatively high density of monitoring stations reflects the fact that glaciers of different sizes and elevation ranges are the main source of water to streams. Thus, each glacier represents a different watershed. The bulk of these records start in the late 1980s/early 1990s. These data collection activities directly support research endeavors of the McMurdo Dry Valleys Long Term Ecological Research project, as well as a host of other science groups working in the MDVs. As such, both real time data and archived data from these sites is available through the online database interface of the project (<a href="http://mcmlter.org">https://mcmlter.org</a>).</p>10aAntarctica10aLTER10aMcMurdo Dry Valleys10ameltwater streams10apolar desert10aresearch catchment1 aGooseff, Michael, N.1 aMcKnight, Diane, M.1 aDoran, Peter, T.1 aFountain, Andrew  uhttps://onlinelibrary.wiley.com/doi/abs/10.1002/hyp.14623