頁籤選單縮合
題名 | 東沙國際實驗--東沙島2010年3月至6月空氣品質變化=The Study of Air Quality Variation of Dongsha Island from March to June in 2010 |
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作者 | 張順欽; | 書刊名 | 行政院環境保護署環境監測及資訊處技術彙刊 |
卷期 | 5 2010.11[民99.11] |
頁次 | 頁1-19 |
分類號 | 445.981 |
關鍵詞 | 大陸沙塵; 長程傳輸; 7SEAS; The 7 South East Asian Studies; Dust storm; Ling-range transport; |
語文 | 中文(Chinese) |
中文摘要 | 環保署以空氣品質監測車於2010年3月在東沙島聯合美國、東南亞國家及國內各研究團隊進行觀測,這是我國首度在東沙島連續監測空氣品質。本文整理2010年3月至6月東沙島空氣品質資料,藉以瞭解污染物長程傳輸現象。東沙監測期間盛行風向,3月至4月以東北風為主,5月風向開始轉變,東北風時數漸減,西南風時數漸增,同時風速減弱,6月風向則以西南風為主,風速多低於東北風期間。PM10及PM2.5平均濃度分別為26.7±26.1 mg m-3及13.6±10.0 mg m-3;SO2平均濃度為2±0.5 ppb;O3平均濃度為40.9±11.6 ppb;CO平均濃度為0.24±0.10 ppm;NOx平均濃度為3.3±1.5 ppb。在不同風向的污染物濃度顯示,PM10、PM2.5、O3、CO均以東北向濃度最高,而最低濃度則均出現在西南向。東北方向氣流PM10濃度35.6±31.6 mg m-3高於西南方向氣流15.6±9.4 mg m-3;PM2.5濃度17.8±11.5 mg m-3高於8.6±5.2 mg m-3;O3濃度52.0±12.8 ppb高於25.9±7.3 ppb;CO濃度0.29±0.10 ppm高於0.17±0.07 ppm。顯示來自東北方向的氣流可能帶來中國大陸或台灣的污染物,而來自西南向的氣流則相對乾淨。不過,來自東北方向氣流SO2濃度1.9±0.6 ppb卻略低於西南方向氣流2.3±0.4 ppb;NOx濃度3.2±1.0 ppb也與3.3±1.8 ppb相近。由於SO2與NOx分別為硫酸鹽及硝酸鹽的前驅物,推測可能在長程傳輸過程,因為轉化程序,因此,SO2與NOx並未如同其他污染物在東北方向出現較高濃度。3月22日受大陸沙塵影響,東沙PM1010及PM2.5小時濃度分別高達557 mg m-3及146 mg m-3,見證了來自華北的污染傳輸現象。此外,O3最高濃度82.6 ppb也顯示污染傳輸的特性。東沙空氣品質監測結果顯示,各項汙染濃度測值與台灣本島或離島背景測值相當,不過偶而會受到汙染傳輸影響,來自西南方向的汙染濃度最低,提供南來氣流的背景濃度資訊。 |
英文摘要 | For the first time the Taiwan EPA cooperated with the U.S. and Southeast Asian countries in the environmental monitoring programs. The objective was to demonstrate the impact of dust storms and pollutants from biomass burning transported from mainland China and Southeast Asia. Three months (within Mar to Jun 2010) were spent observing air quality in the nearby areas of the South China Sea in order to monitor long-term conditions. The observed mean concentrations of PM10, PM2.5, SO2, O3, CO and NOx were 26.7±26.1 mg m-3, 13.6±10.0 mg m-3, 2±0.5 ppb, 40.9±11.6 ppb, 0.24±0.10 ppm and 3.3±1.5 ppb respectively. The concentrations of PM10, PM10, O10 and CO show the highest peaks with the Northeastern winds, while the lowest values come along with the Southwestern winds. These results indicate the Northeastern winds might carry the pollutants from Mainland China or Taiwan and are not as clean as the Southwestern winds tend to be. However, the SO2 mean concentration with Southwestern winds (2.3±0.4 ppb) is higher than that with Northeastern winds (1.9±0.6 ppb), while the NOX mean concentrations from both wind directions are very close to each other. As SO2 and NOx are the precursors of sulfate and nitrate, the oxidation reactions taking place during long-range transport might play an important role in these conditions. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。