Table 1 TWS trends and supporting information

From: Emerging trends in global freshwater availability

Region Location Area (km2) TWS trend (Gt yr−1) TWS trend errors (Gt yr−1) r2 of TWS trend Irrigated area (%) Precipitation trend (mm yr−1) Precipitation trend (% yr−1) Precipitation percentage of normal (%) Predicted precipitation change (%)
1 Antarctica 12,397,401 −127.6 39.9 0.93 0 0.82 0.40 96.6 30.9
2 Greenland 2,184,307 −279.0 23.2 0.97 0 8.85 2.09 102.7 39.1
3 Gulf of Alaska coast 716,492 −62.6 8.2 0.93 0 −3.03 −0.25 95.0 21.3
4 Canadian Archipelago 672,413 −74.6 4.1 0.95 0 −5.33 −2.11 94.5 38.3
5 Northern North America 1,350,129 6.1 5.8 0.52 0 2.35 0.73 105.1 26.9
6 Northern Eurasia 8,009,175 13.4 9.7 0.10 0 1.65 0.30 104.4 25.1
7 Northern India 664,169 −19.2 1.1 0.80 54 15.80 2.20 101.0 11.8
8 Central India 1,352,670 9.4 0.6 0.24 51 3.72 0.36 103.7 23.1
9 Eastern Central China 657,375 7.8 1.6 0.78 14 7.33 0.77 99.6 7.9
10 Tibetan Plateau 881,704 7.7 1.4 0.67 0 −1.52 −0.90 104.2 19.7
11 Northwestern China 215,152 −5.5 0.5 0.77 7 1.11 0.57 109.8 15.3
12 North China Plain 876,004 −11.3 1.3 0.63 52 −2.33 −0.37 103.0 19.4
13 Eastern India Region 1,228,839 −23.3 1.9 0.85 25 −9.52 −0.67 96.1 14.7
14 Northwestern Saudi Arabia 841,763 −10.5 1.5 0.92 0 −1.44 −1.31 77.7 −1.4
15 Northern Middle East 2,189,561 −32.1 1.5 0.84 5 −2.80 −0.90 96.3 −8.5
16 Southwestern Russia Region 1,772,712 −18.1 1.3 0.64 15 −5.83 −0.92 96.8 6.2
17 Aral Sea 52,299 −2.2 0.1 0.76 0 2.71 1.17 111.1 5.9
18 Caspian Sea 377,761 −23.7 4.2 0.76 0 −4.37 −1.14 103.4 2.1
19 Central Canada 802,682 −7.0 6.4 0.73 0 0.69 0.17 102.0 16.9
20 Northern Great Plains 1,333,598 20.2 4.8 0.79 3 2.26 0.44 102.0 7.0
21 Southern California 177,996 −4.2 0.4 0.46 18 −8.31 −1.29 89.7 1.2
22 Southern High Plains and eastern Texas 1,105,113 −12.2 3.6 0.44 9 −5.71 −0.76 95.2 −2.8
23 Patagonian ice fields 461,198 −25.7 5.1 0.89 0 −8.01 −0.76 97.1 −6.9
24 Central Argentinaa 530,661 −8.6 1.2 0.77 4 1.87 0.32 94.2 0.7
25 Central and western Brazil 5,559,805 51.9 9.4 0.39 1 0.61 0.03 100.2 −5.0
26 Eastern Brazil 1,132,450 −16.7 2.9 0.39 1 −16.97 −1.61 97.7 −5.9
27 Okavango Delta 1,589,692 29.5 3.5 0.55 0 −5.21 −0.61 105.3 −8.7
28 Nile headwaters 1,824,276 21.9 3.9 0.56 1 −3.53 −0.30 97.7 11.6
29 Tropical western Africa 2,298,134 24.1 2.1 0.67 1 −0.12 −0.01 103.4 −6.3
30 Northern Congo 1,318,261 −7.2 1.0 0.26 0 −1.55 −0.10 99.1 7.1
31 Southeastern Africa 1,677,719 −12.9 2.3 0.47 0 −3.23 −0.32 95.9 −5.9
32 Northern Africa 6,664,135 −11.7 2.9 0.45 1 −0.12 −0.19 106.7 −12.9
33 Northern & Eastern Australia 2,504,494 19.0 2.8 0.32 3 4.30 0.69 104.6 −6.0
34 Northwestern Australia 1,002,367 −8.9 1.2 0.43 0 −0.39 −0.10 99.1 −0.6
  1. Location; area; GRACE-based TWS trend (April 2002–March 2016) and uncertainty; coefficient of determination (r2) of the fitted linear trend; percentage of the area equipped for irrigation23; trend in precipitation22 (January 2002–March 2016) after removing the seasonal cycle; annual mean precipitation (2003–2015) as a fraction of the long-term (1979–2015) annual mean22; and median precipitation change between the periods 1986–2005 and 2081–2100, predicted using the IPCC high-end greenhouse gas emissions scenario25 for each of the 34 study regions.
  2. aThe TWS trend in region 24 is for April 2002–February 2010 only.