在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 行業相關 » 正文

“炎熱指數”的由來及其重要性

放大字體  縮小字體 發布日期:2011-08-06
核心提示:炎熱指數是一個理解濕熱對人體的影響的極為重要的度量方式,國家氣象局(NWS)表示:“當熱增量超過人體能夠排除掉的水平時,體溫開始升高,與炎熱有關的疾病和身心失調也會出現。”


Posted at 10:30 AM ET, 07/21/2011
The origins of the heat index and why it’s important
By Jason Samenow


Heat is the top weather related killer in the U.S. But there’s truth in the saying, “It’s not the heat, it’s the humidity.” The body cools itself at a slower rate when the humidity is high. For this reason, the heat index was devised, to provide a measure of how hot it actually feels - hence alternative names such as “apparent temperature,” “feels like temperature,” “real-feel temperature”(AccuWeather trademark), “humiture,” and in Canada, “humidex.”

Perhaps originating from some commentary by radio host Rush Limbaugh, questions have arisen as to whether the heat index is a legitimate scientific measure. I can assure you it is. Moreover, it’s critical for communicating health risks related to the potentially deadly combination of heat and humidity.

The roots of the heat index can be traced to Osborn Fort Hevener (described by the New Yorker as a New Jersey weather buff), who coined the term humiture in the early 1900s. In a 1959 issue of Weatherwise magazine, Hevener wrote: Twenty-two years ago, I was fortunate to coin two words that have found their way into the dictionaries, and to develop a concept that has proven useful and popular. To let the secret out, I am the humiture man.

In the 1957 Thondike-Barnhart dictionary, humiture was defined as ”a combined measurement of temperature and humidity, arrived at by adding degrees of temperature to percentage of relative humidity and dividing by two.”


But this simplistic definition would evolve.

Jacksonsville, Fla. broadcast meteorologist George Winterling, published a revised and adapted version of the humiture in the late 1970s in the Bulletion of the American Meteorological Society and began reporting it on-air.

Based on the work of Robert Steadman, who published several seminal studies on the “assessment of sultriness,” the National Weather Service (NWS) then made operational what became the heat index

The heat index results from a whole research area on weather and its effects on the human body, known as biometeorology. The index is grounded in established relationships describing the exchange of heat and moisture between the human body and the atmosphere.

Consider all the following quantities factored into determining heat index: vapor pressure, dimensions of a human, effective radiation area of skin, significant diameter of a human, clothing cover, core temperature, core vapor pressure, surface temperatures and vapor pressure of skin and clothing, activity, effective wind speed, clothing resistance to heat transfer, clothing resistance to moisture transfer, radiation from the surface of the skin, convection from the surface of the skin, sweating rate, ventilation rate, skin resistance to heat transfer, skin resistance to moisture transfer and surface resistance to moisture transfer.

For practical purposes, all of these quantities can be condensed into an simplified equation for calculating heat index requiring just temperature, relative humidity, and a number of constants.

You can also calculate heat index knowing merely the temperature and dew point (another measure of humidity). The NWS Web site features a handy on-line calculator for determining the heat index based on a combination of either temperature and relative humidity or temperature and dew point. Or, you can consult the chart below.



The NWS cautions that its given heat index values assume shady, light wind conditions and that exposure to direct sunlight can increase the heat index by 15 degrees.

The bottom line is that the heat index is an extremely important measure for understanding heat and humidity’s impact on the body. As the NWS notes: “When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat related illnesses and disorders may develop.”


參考譯文:
炎熱在美國已成為與致人非命有關的頭等天氣。但這一說法的事實是,“問題不在炎熱,而是潮濕。”當濕度較高時身體會以較慢的速率進行自我降溫。因此之故,炎熱指數就問世了,它為身體感覺到底有多熱提供了一個度量方法——因此它又被稱為“表觀溫度”、“感覺起來的溫度”、“真實感覺溫度”和“溫濕度”,在加拿大它被稱為“濕潤指數”。

也許是源自電臺主持人拉什•利姆鮑(Rush Limbaugh)的一些評論,關于炎熱指數是否是一個合情理的科學標準的問題被提了出來。我能確定的就是這個。此外,傳播與炎熱和潮濕的潛在致命結合有關的健康風險很是關鍵。

炎熱指數的根源被追溯到奧斯本•佛特•希維納Osborn Fort Hevener)(他被紐約人稱為新澤西的一個天氣狂),他在二十世紀初創造了溫濕度這一術語。1959年,希維納在《天氣》(Weatherwise)雜志第12卷第2期的一篇文章上寫道:“22年前,我有幸創造了兩個現已被收進詞典的詞并提出了一個已被證明是有用和受歡迎的概念。為了讓這個秘密傳出去,我就是那個提出‘溫濕度’的人。”

1957年的Thondike-Barnhart詞典,“溫濕度”被定義為“一個結合了溫度和濕度的度量指標,通過將溫度的度數加到相對濕度百分數上除以二得到。”

但是這個過于簡化的定義會繼續演化。

佛羅里達州杰克遜維爾(Jacksonsville)廣播氣象學家喬治•溫特靈(George Winterling)在上個世紀七十年代末的《美國氣象學會通訊》(Bulletion of the American Meteorological Society)上發表過一個“溫濕度”的修訂和改編版,并開始現場直播。

基于羅伯特•斯泰德曼(Robert Steadman)的工作——他發表過一些對以后發展有重大影響的有關悶熱的研究,國家氣象局(National Weather Service,NWS)接著使什么成為炎熱指數變得可操作。

炎熱指數源于對天氣的全面研究和它對人體的影響,亦即生物氣象學。這一指數是建立在描述人體和大氣之間的濕熱交換關系基礎上的。

下述因素都被納入到確定炎熱指數的參考要素中:水汽壓、人的身材、皮膚的有效輻射面積、人的胸腰圍、服裝遮蓋范圍、體核溫度、體核水汽壓、皮膚和服裝的表面溫度和水汽壓、活動量、有效風速、服裝的耐熱性、服裝的耐潮性、皮膚表面的輻射、皮膚表面的對流、出汗率、通風率、皮膚的耐耐熱性、皮膚的耐潮性和表面耐潮性。

為了實用的目的,所有這些參量都能被納入到一個只需溫度、相對濕度和一些常量的簡化方程式中。

即使只知道溫度和露點(濕度的另一個度量方式),你可以計算出炎熱指數。國家氣象局(NWS)網站公布了一個方便的在線計算器便于大家基于溫度和相對濕度或溫度和露點的結合來計算炎熱指數。或者,你也可以參考下圖。



國家氣象局(NWS)提醒道,它給出的炎熱指數值并不可靠,微風條件和暴露于陽光直射下都能增加炎熱指數15度。

基本的一點是,炎熱指數是一個理解濕熱對人體的影響的極為重要的度量方式。正如國家氣象局(NWS)所說:“當熱增量超過人體能夠排除掉的水平時,體溫開始升高,與炎熱有關的疾病和身心失調也會出現。”

原文鏈接:http://www.washingtonpost.com/blogs/capital-weather-gang/post/the-origins-of-the-heat-index-and-why-its-important/2011/07/21/gIQASKrnRI_blog.html
更多翻譯詳細信息請點擊:http://www.trans1.cn
編輯:foodtrans

 
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ 加入收藏 ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 0.236 second(s), 18 queries, Memory 0.92 M
51La
主站蜘蛛池模板: 四虎最新影院 | 国产国产成人人免费影院 | 在线观看精品国产福利片100 | 奇米四色777亚洲图 奇米影视四色首页手机在线 | 韩彩英三级无删版甜性涩爱 | 就去干综合 | 四虎影院永久网址 | 日本一区二区不卡视频 | 天天干天天爱天天射 | 情久久 | 欧洲精品码一区二区三区免费看 | 激情亚洲色图 | 免费在线黄色网址 | 久久国产精品免费专区 | 国产免费好大好硬视频 | 中文字幕一区二区三区乱码aⅴ | 视频在线观看网站免费 | 啪啪网站免费 | 99综合久久 | 手机看片免费福利 | bbbb毛片免费看 | 午夜影院观看 | 午夜在线视频 | 四虎院影永久在线观看 | 国产午夜三级 | 东北老女人啪啪对白 | 午夜免费啪视频观看网站 | 亚洲高清美女一区二区三区 | sis色中色 | 天堂福利视频在线观看 | 日韩欧美亚洲综合一区二区 | 欧美一级在线观看视频 | 国产视频二区 | 99在线国产 | 天堂成人网 | 久久婷五月 | 26uuu另类欧美亚洲曰本 | 欧美激情亚洲精品日韩1区2区 | 国产黄色大片又色又爽 | 中文字幕亚洲一区二区va在线 | 黄色短视频免费看 |
寰俊浜岀淮鐮�