Research Article
Analysis and Comparison of Trends in Extreme Temperature Indices in Riyadh City, Kingdom of Saudi Arabia, 1985–2010
Table 2
Results of the trend, urbanization effect, and urbanization effect contribution analyses.
| Index | Urban trend () | Rural trend () | Urbanization effect () | Urbanization contribution (, %) |
| TXa (°C yr−1) | 0.045b | 0.069c | −0.023 | 51 | TNa (°C yr−1) | 0.068c | 0.083c | −0.015a | 22 | TXx (°C yr−1) | 0.018 | 0.049b | −0.030b | 167 | TNx (°C yr−1) | 0.096c | 0.101c | −0.005 | 5 | TXn (°C yr−1) | 0.037 | 0.053 | −0.017 | 46 | TNn (°C yr−1) | 0.005 | 0.007 | −0.002 | 40 | DTR (°C yr−1) | −0.023 | −0.014 | −0.009 | 39 | TN10p (d yr−1) | −0.557b | −0.627c | 0.070 | 13 | TX10p (d yr−1) | −0.248b | −0.414c | 0.166a | 67 | TN90p (d yr−1) | 0.327a | 0.468c | −0.141b | 43 | TX90p (d yr−1) | 0.220a | 0.385c | −0.165b | 75 | WSDI (d yr−1) | 0.165 | 0.278 | −0.114 | 69 | CSDI (d yr−1) | −0.420 | −0.161 | −0.259 | 62 |
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Statistically significant at the 90% level.
bStatistically significant at the 95% level.
cStatistically significant at the 99% level.
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