CFE agenda 091117 - Laserfiche WebLink

Browse Search

Climate Change Assessment for Water Resources Region 03 South Atlantic -Gulf Figure 2.5. Statistically significant linear trends in (a) soil moisture index (unitless) and (b) annual precipitation (cm) for the continental U.S., 1895 — 2006. The South Atlantic -Gulf Region is within the red oval (Grundstein, 2009). As described in Section 2. 1, a similar study by Wang et al. (2009) also focused on historical climate trends across the continental U.S. using gridded climate data and a shorter period of record (1950 — 2000). The authors identified generally positive significant trends in annual precipitation for most of the U.S. For the South Atlantic -Gulf Region, the authors identified a mild increasing trend in winter precipitation for most of the area (Figure 2.1). Results were mixed for the other seasons, with some areas showing increasing precipitation and others showing decreasing precipitation. A 2011 study by McRoberts and Nielsen- Gammon used a new continuous and homogenous data set to perform precipitation trend analyses for sub - basins across the United States. The extended data period used for the analysis was 1895 — 2009. Linear positive trends in annual precipitation were identified for most of the U.S (Figure 2.6). For the South Atlantic -Gulf Region, results were mixed with some areas showing mild decreases in precipitation and others showing mild increases. No clear trend for the area is evident from these results. USACE Institute for Water Resources 12 January 9, 2015