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<br />Target & Control Area dSWE <br /> <br />" <br /> <br />.SJ..... <br />.I.C~ I <br />at.roc~J <br /> <br />" <br /> <br /> <br /> <br />o -.. <br />'" ,. <br />-Do; <br /> <br /> -~ ~LL :~~~~ <br />> . ,. ,. ". ". ,. . ,. ". U. U. ". ". 20. 22. "J <br />Co< Do; '"" "., ,.. ,.. ,.. ... "" "" ... w.. Me, U.' Mer !,la, W.. <br /> Dal.,2005-2OOI <br /> <br /> <br /> <br />! <br />~ .. <br />. <br />. <br /> <br />02 <br /> <br />~, <br /> <br />Hgure 3. Are.,1 iwemgt! values of 24 hr dSWE for the 5.tn Juan targl't are.' (r('d), l.onl' Cone <br />control ilreel (cyan), and the Uncompahgre control are.' (yellow). stratified by dale. Thl' datl's <br />cover the ~)('riods of sL'Cding UM' met the conl.,mination criteria. <br /> <br />variation in dSWE. The differences between target and control area dSWE arc ex.pressed as a <br />percentage of the target dSWE in Fig. 4. These values range between -71% (decrease in target) <br />and 17,537% (increase in target). The large positive values resulted primarily from dividing by <br />ncar-zero values in the control area (little total snow). Nevertheless, such large departures from <br />values expected from winter seeding (5-20%) arc indicative that Ihe s(,l'dinJ,t could nnt hl' <br />rl'SIJUnsihl1' ror Ihl'larJ,t1' calculated percl'lllal-:e dirrerences. <br /> <br />Indeed, maps of dSWE across the target and control areas generally show spatial variations of <br />dSWE on scales larger than those of the target and control areas. These variations suggest that <br />they arc due to difTerences in locations or trajectories of the stonns themselves. rather than any <br />signal from seeding. Take, for example, the case depicted by Fig. 5. A stmng cold front passed <br />through the area from the northwest, causing strong northwesterly winds to Ilow ups/opt> on the <br />north-south oriented mountains to the north of the target, producing light to moderate snow there. <br />Conversely, these winds wnuld have l1nwed downs/ope over the target area (suuth of the <br />Continental Divide), causing warming and drying. So in this case, the larger-scale <br />meteorological conditions controlled the snowf.111 (dSWE) spatial pattern. masking the seeding <br /> <br />7 <br />