Effects of surface friction and turbulent mixing on long-term changes in the near-surface wind speed over the Eastern China Plain from 1981 to 2010

2017 ◽  
Vol 51 (5-6) ◽  
pp. 2285-2299 ◽  
Author(s):  
Jian Wu ◽  
Jinlin Zha ◽  
Deming Zhao ◽  
Qidong Yang
Keyword(s):  
Wind Speed ◽  
Turbulent Mixing ◽  
Eastern China ◽  
Surface Wind ◽  
Surface Friction ◽  
Surface Wind Speed ◽  
Near Surface ◽  
Long Term Changes

scholarly journals Homogenization and Trend Analysis of Canadian Near-Surface Wind Speeds

2010 ◽  
Vol 23 (5) ◽  
pp. 1209-1225 ◽  
Author(s):  
Hui Wan ◽  
Xiaolan L. Wang ◽  
Val R. Swail
Keyword(s):  
Wind Speed ◽  
Trend Analysis ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
The United States ◽  
Homogeneity Test ◽  
Near Surface ◽  
Wind Speeds ◽  
Long Term Trends

Abstract Near-surface wind speeds recorded at 117 stations in Canada for the period from 1953 to 2006 were analyzed in this study. First, metadata and a logarithmic wind profile were used to adjust hourly wind speeds measured at nonstandard anemometer heights to the standard 10-m level. Monthly mean near-surface wind speed series were then derived and subjected to a statistical homogeneity test, with homogeneous monthly mean geostrophic wind (geowind) speed series being used as reference series. Homogenized monthly mean near-surface wind speed series were obtained by adjusting all significant mean shifts, using the results of the statistical test and modeling along with all available metadata, and were used to assess the long-term trends. This study shows that station relocation and anemometer height change are the main causes for discontinuities in the near-surface wind speed series, followed by instrumentation problems or changes, and observing environment changes. It also shows that the effects of artificial mean shifts on the results of trend analysis are remarkable, and that the homogenized near-surface wind speed series show good spatial consistency of trends, which are in agreement with long-term trends estimated from independent datasets, such as surface winds in the United States and cyclone activity indices and ocean wave heights in the region. These indicate success in the homogenization of the wind data. During the period analyzed, the homogenized near-surface wind speed series show significant decreases throughout western Canada and most parts of southern Canada (except the Maritimes) in all seasons, with significant increases in the central Canadian Arctic in all seasons and in the Maritimes in spring and autumn.

Future projections of the near-surface wind speed over eastern China based on CMIP5 datasets

2020 ◽  
Vol 54 (3-4) ◽  
pp. 2361-2385 ◽  
Author(s):  
Jinlin Zha ◽  
Jian Wu ◽  
Deming Zhao ◽  
Wenxuan Fan
Keyword(s):  
Wind Speed ◽  
Eastern China ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
Near Surface ◽  
Future Projections

scholarly journals Long-Term Trends in Near-Surface Wind Speed over the Southern Hemisphere: A Preliminary Analysis

2016 ◽  
Vol 07 (07) ◽  
pp. 938-943 ◽  
Author(s):  
Luiz Felipe N. Cardoso ◽  
Wanderson Luiz Silva ◽  
Maria G. A. Justi da Silva
Keyword(s):  
Wind Speed ◽  
Southern Hemisphere ◽  
Preliminary Analysis ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
Near Surface ◽  
Long Term Trends

scholarly journals Slowdown and reversal of terrestrial near-surface wind speed and its future changes over eastern China

2021 ◽  
Vol 16 (3) ◽  
pp. 034028
Author(s):  
Jinlin Zha ◽  
Cheng Shen ◽  
Deming Zhao ◽  
Jian Wu ◽  
Wenxuan Fan
Keyword(s):  
Wind Speed ◽  
Eastern China ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
Near Surface

scholarly journals Terrestrial stilling will continue during the 21st century

2021 ◽  
Author(s):  
Deliang Chen ◽  
Kaiqiang Deng ◽  
Cesar Azorin-Molina ◽  
Song Yang ◽  
Gangfeng Zhang ◽  
...  
Keyword(s):  
Wind Speed ◽  
21St Century ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
New Paradigm ◽  
Near Surface ◽  
The Pacific ◽  
Long Time

Abstract The near-surface wind speed over land has declined in recent decades, a trend known as terrestrial stilling (TS)1-2. However, recent studies have indicated a reversal of the TS in the Northern Hemisphere (NH) during the last decade3-6, triggering renovated interest in the wind speed changes. Here we show that the TS in the NH mid-latitudes will continue in all seasons throughout the 21st century, especially in summer. The recent reversal of TS is most likely a multi-decadal fluctuation related to the Pacific and Atlantic climate variations, rather than a secular trend. A new paradigm of the future TS is further proposed, which is related to an intensified subsidence inversion over the mid-latitudes, caused by enhanced tropical and subtropical convections. This study reveals the important role of global warming in reducing the near-surface wind speed on long time scales. The continuing TS means a long-term strategy for wind energy production needs to be developed, particularly for the NH mid-latitude countries.

scholarly journals Contribution of variations in Northern Hemisphere annular mode to the near-surface wind speed changes over Eastern China for 1979-2017

2021 ◽  
Author(s):  
Jinlin Zha ◽  
Cheng Shen ◽  
Jian Wu ◽  
Deming Zhao ◽  
Cesar Azorin-Molina
Keyword(s):  
Wind Speed ◽  
Temperature Gradient ◽  
Northern Hemisphere ◽  
Air Temperature ◽  
Eastern China ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
Near Surface ◽  
Annular Mode ◽  
Northern Hemisphere Annular Mode

Abstract Studies have shown that large-scale ocean-atmosphere circulations (LOACs) played the major role to the near-surface wind speed (NWS) changes over China; however, the mechanisms whereby LOACs influences NWS to have received little attention. In this study, the processes of the Northern Hemisphere annular mode (NAM) influencing the NWS changes are revealed over eastern China for 1979–2017. The results showed a slowdown in NWS, at a rate of − 0.09 ± 0.01 m s− 1 decade− 1; meanwhile, this decline could be partly driven by the weakening of the zonal wind component. When the NAM exhibits positive phases, the zonal-mean westerly weakens at the low-to-mid-latitudes (10°–40°N); meanwhile, in the troposphere descending flows prevail near 40°N and ascending flows prevail near 65°N, and in the lower troposphere there are northerly anomalies at the low-to-mid-latitudes and southerly anomalies at mid-to-high latitudes (40°–70°N). The anomalous meridional flows transport heat from lower latitudes to higher latitudes and weaken the north–south air temperature gradient. The decreased air temperature gradient over East Asia reduces the pressure-gradient near the surface in eastern China, thereby decreasing the NWS. Furthermore, the effects of NAM on NWS changes are more significant at interannual scale than decadal scale. 32.0 ± 15.8 % of the changes in the annual mean NWS are caused by the variations in NAM; meanwhile, the NAM contribution to the interannual changes in the zonal component of NWS reach 45.0 ± 12.9 %.

Recurrence Characteristics Analysis of Near-Surface Wind Speed Signal with Different Sampling Frequencies

2014 ◽  
Vol 599-601 ◽  
pp. 1605-1609 ◽  
Author(s):  
Ming Zeng ◽  
Zhan Xie Wu ◽  
Qing Hao Meng ◽  
Jing Hai Li ◽  
Shu Gen Ma
Keyword(s):  
Wind Speed ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
Recurrence Plot ◽  
Sampling Frequency ◽  
Near Surface ◽  
Gas Leakage ◽  
Time Period ◽  
Characteristics Analysis ◽  
Quantification Analysis

The wind is the main factor to influence the propagation of gas in the atmosphere. Therefore, the wind signal obtained by anemometer will provide us valuable clues for searching gas leakage sources. In this paper, the Recurrence Plot (RP) and Recurrence Quantification Analysis (RQA) are applied to analyze the influence of recurrence characteristics of the wind speed time series under the condition of the same place, the same time period and with the sampling frequency of 1hz, 2hz, 4.2hz, 5hz, 8.3hz, 12.5hz and 16.7hz respectively. Research results show that when the sampling frequency is higher than 5hz, the trends of recurrence nature of different groups are basically unchanged. However, when the sampling frequency is set below 5hz, the original trend of recurrence nature is destroyed, because the recurrence characteristic curves obtained using different sampling frequencies appear cross or overlapping phenomena. The above results indicate that the anemometer will not be able to fully capture the detailed information in wind field when its sampling frequency is lower than 5hz. The recurrence characteristics analysis of the wind speed signals provides an important basis for the optimal selection of anemometer.

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