Snow patches within and adjacent to stream channels in the Fryxell Basin of Taylor Valley, Antarctica were sampled during the 2021-2022 austral summer as part of the McMurdo Dry Valleys Long Term Ecological Research program. This data package includes snow pit measurements (snow temperature, depth, density, and water equivalent) as well as chemical characteristics of snow samples that were analyzed for nutrient, cation, and anion concentrations.
Measurements for snow pits dug across Taylor Valley were obtained for this dataset during November and December of the 2021-2022 field season. Snow patches were specifically sampled early in the year before the streams had started to flow. Snow pits were dug both within stream channels and adjacent to stream channels for 10 streams across Lake Fryxell Basin and Commonwealth Stream in Taylor Valley. Snow depth of each pit was recorded and snow density was measured using a snow cutter of known volume and a spring scale. Snow density and snow depth was then used to calculate snow water equivalent (SWE) of each snow patch sampled.
Snow samples for each pit were also collected using a snow core device. The snow samples were put in a whirlpack bag and transported back to the field laboratory at F6 camp. At F6, samples were melted and filtered for nutrient, cation, and anion analysis. Because not all samples had enough water for all analysis, nutrient analysis was prioritized and anions/cations were not able to be run for every sample. For anions and cations, 50 mls (for each) of the melted snow water was filtered through a Nucleopore (0.4 µm) filter. The filtrate was saved and stored at +4 °C for future analysis. For nutrients, 100 ml of raw melted snow sample was filtered through an ashed GF/C filter. The filtrate was saved and frozen at -20 °C for future analysis.
All analysis was run by the MCM LTER at the Crary Laboratory at McMurdo Station or at the University of Colorado Boulder, in the same way that stream water samples are rum as part of the long-term sample collection for the MCM LTER. Anions and cations were run in the Crary Laboratory at McMurdo Station between 2021-12-03 and 2022-01-14 with a dilution factor of 1. Nutrients (N & SRP) were run at the University of Colorado Boulder on 2022-06-07.
This work was supported by the US National Science Foundation grants #OPP-1637708 and #OPP-2224760 for Long Term Ecological Research.
"Mchanga wa theluji ndani na karibu na mifereji ya mto katika Bonde la Frycel la Taylor, Antarctica, ulichukuliwa wakati wa majira ya joto ya 2021-2022 kama sehemu ya ""Makumbusho ya Chumvi ya McMurdo"" Programu ya Utafiti wa Kiikolojia wa Muda Mrefu." Mfano wa mchanganyiko huu ni pamoja na vipimo vya shimo la theluji (kiwango cha joto, kina, wiani, na usawa wa maji) na sifa za kemikali za sampuli za theluji ambazo zilichambuliwa kwa viwango vya virutubisho, cation, na anion. Uchunguzi wa maporomoko ya theluji yaliyochimbwa katika Bonde la Taylor ulipatikana kwa seti hii ya data wakati wa Novemba na Desemba wa msimu wa shamba wa 2021-2022. Vipande vya theluji vilichukuliwa hasa mapema mwaka kabla ya mito kuanza kutiririka. Mapango ya theluji yalichimbwa ndani ya mifereji ya mto na karibu na mifereji ya mto kwa mito kumi katika Bonde la Ziwa Fryxell na Mto wa Jumuiya ya Madola katika Bonde la Taylor. Umbali wa theluji ya kila shimo ilirekodiwa na wiani wa theluji ulipimwa kwa kutumia cutter ya theluji ya kiasi cha kujua na kiwango cha spring. Kiasi cha theluji na kina cha theluji kilitumiwa kuhesabu usawa wa maji ya theluji (SWE) ya kila kipande cha theluji kilichochukuliwa. Sampuli za theluji kwa kila shimo pia zilikusanywa kwa kutumia kifaa cha msingi wa theluji. Mfano wa theluji ulipelekwa kwenye chombo cha kuchunguza theluji na kupelekwa kwenye kambi ya F6. Katika F6, sampuli ziliyeyushwa na kuchujwa kwa ajili ya mchanganyiko wa virutubisho, cation, na anion. Kwa sababu sampuli zote hazikuwa na maji ya kutosha kwa uchambuzi wote, uchambuzi wa virutubisho ulipewa kipaumbele na anions au cations hazikuweza kuendeshwa kwa kila sampuli. Kwa anions na cations, 50 ml (kwa kila) ya maji ya theluji iliyopunguzwa ilifunikwa kupitia kichujio cha Nucleopore (0.4 μm). Filtrate ilifungwa na kuhifadhiwa kwa +4 ° C kwa uchambuzi wa baadaye. Kwa ajili ya virutubisho, 100 ml ya sampuli ya theluji iliyomwagika ilichujwa kupitia kichujio cha GFC. Filtrate ilifungwa na kufungia kwenye -20 ° C kwa ajili ya uchambuzi wa baadaye. Uchunguzi wote ulifanywa na MCM LTER katika Maabara ya Cray katika Kituo cha McMurdo au katika Chuo Kikuu cha Colorado Boulder, kwa njia ile ile ambayo sampuli za maji ya mto ni rum kama sehemu ya mkusanyiko wa sampuli ya muda mrefu kwa MCM LTER. Anions na cations ziliendeshwa katika Maabara ya Cray katika Kituo cha McMurdo kati ya 2021-12-03 na 2022-01-14 na sababu ya upungufu wa 1. Utafiti wa NRP ulifanyika katika Chuo Kikuu cha Colorado Boulder mnamo Juni 2022. Kazi hii ilifadhiliwa na US National Science Foundation grants #OPP-1637708 na #OPP-2224760 kwa Utafiti wa Muda Mrefu wa Ikolojia.