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lowlyshowy新蟲 (初入文壇)
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臭氧 8小時(shí)均值 怎么計(jì)算？ 已有1人參與
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| 有一天24小時(shí)的臭氧濃度的時(shí)均值，如何計(jì)算當(dāng)日的臭氧 8小時(shí)濃度均值？謝謝！ |
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小木蟲: 金幣+0.5, 給個(gè)紅包，謝謝回帖
小木蟲: 金幣+0.5, 給個(gè)紅包，謝謝回帖
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8小時(shí)濃度均值即連續(xù)8個(gè)小時(shí)濃度的平均值。對(duì)于臭氧，應(yīng)取連續(xù)8個(gè)小時(shí)平均值的最大值. 例如N1=avg{c1,c2,c3,,,,c8} N2=avg{c2,c2,c3,,,,c9} N3=avg{c3,c2,c3,,,,c10} 依次推出，N17=avg{c17,c2,c3,,,,c24} 臭氧日8小時(shí)最大值=max{N1,N2,N3,,,,,N17}. 這里有一點(diǎn)需要注意：上面到N17就結(jié)束了，但是否繼續(xù)循環(huán)下去，即一直到N24=avg{c24, c1‘,c2',c3',,,,,c7}，才算一整天，即今天與明天是否有交疊的情況，這個(gè)得查美國(guó)的做法。 [ Last edited by byfgogo on 2013-1-31 at 22:23 ] |
2樓2013-01-31 21:49:35
lowlyshowy
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EPA上的Q&A里面有解釋 Q: How do I compute the daily maximum 8-hour average ozone concentration? The new Aerometric Information Retrieval System (AIRS) will do this computation for you. First, running 8-hour averages are computed from the hourly ozone concentration data for each hour of the year and the result is stored in the first, or start, hour of the 8-hour period. In the event that only 6 (or 7) hourly averages are available, the 8-hour average is computed using 6 (or 7) as the divisor. Generally, if fewer than 6 hours of ozone concentration data are available, then the 8-hour daily maximum concentration for the day is assigned the value of ‘ missing.' However, just because we are missing more than 2 hours of monitoring data, we do not want to ignore 8-hour concentrations that clearly exceed the level of the standard. When more than 2 hours of monitoring data are missing, we compute the 8-hour average concentration by substituting one-half the minimum detectable limit for the missing hourly concentrations and using 8 as the divisor. In this case, if the computed 8-hour average concentration is greater than 0.08 ppm, it is retained, otherwise the 8-hour concentration for this 8-hour period is assigned the value of ‘missing.' In all cases, the computed 8-hour average ozone concentration is reported in parts per million (ppm) to three decimal places (the insignificant digits to the right of the third decimal place are truncated). |
3樓2013-02-01 08:44:43
4樓2013-02-01 10:26:36
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