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據(jù)外媒報道，慕尼黑擁有了世界上個基于地面大氣遙感測量城市溫室氣體排放的全自動傳感器網(wǎng)絡(luò)。它是由德國慕尼黑工業(yè)大學(xué)（TUM）環(huán)境傳感與建模教授Jia Chen團(tuán)隊的科學(xué)家開發(fā)。現(xiàn)在，任何人都可以通過互聯(lián)網(wǎng)平臺查看測量數(shù)據(jù)。
傳感器網(wǎng)絡(luò)MUCCnet由五個分析太陽光譜的高精度光學(xué)儀器組成。它們負(fù)責(zé)測量氣體的二氧化碳（CO2）、甲烷（CH4）和一氧化碳（CO）的濃度。由于每種氣體都有其獨(dú)特的光譜“指紋”，所以這些氣體的濃度可以通過儀器跟太陽之間的氣柱來測定。“通過測量大氣的垂直柱，可以消除當(dāng)?shù)氐母蓴_如鄰近煙囪的不成比例的影響。因此，這種溫室氣體平衡被認(rèn)為是特別可靠和準(zhǔn)確的，”Jia Chen教授說道。
MUCCnet的一個測量設(shè)備位于TUM的主校區(qū)，用于測量市中心的濃度。其他四個設(shè)備則位于慕尼黑城市邊界的四個主要方向。
Chen用簡單的術(shù)語解釋了這個原理：“我們在城市的逆風(fēng)處設(shè)置了一個傳感器，在逆風(fēng)處設(shè)置了第二個。所以個傳感器和第二個傳感器之間的氣體增加一定是由城市內(nèi)部產(chǎn)生的。”而為了覆蓋盡可能多的風(fēng)向，每個基本方向都有一個傳感器。通過輸入傳感器數(shù)據(jù)和氣象參數(shù)，高性能計算機(jī)可以創(chuàng)建一個空間解析的城市排放圖。
根據(jù)巴黎氣候協(xié)議，大氣測量不需要達(dá)到排放目標(biāo)。“相反，我們在新聞上聽到的排放數(shù)字是基于計算得出的，”Chen指出。
除此之外，這使得無法檢測到迄今未知的來源如天然氣管道的泄漏。因此，Chen領(lǐng)導(dǎo)的團(tuán)隊和項目負(fù)責(zé)人Florian Dietrich創(chuàng)建了MUCCnet從而能高精度測量排放、減少計算的不精確性。
由于德國在2020年春季和2020-2021年冬季各封鎖了一次，在這期間交通得到了大量的減少，這使得這場新冠危機(jī)為研究人員提供了一個有用的自然實驗。
然而遺憾的是，二氧化碳的壽命很長（幾百年），測量結(jié)果表明，即使是像這次大流行這樣劇烈的全球事件也沒有阻止大氣中二氧化碳濃度每年都增加的情況發(fā)生。
自2021年初以來，研究人員開設(shè)運(yùn)營了一個網(wǎng)站，其不僅向每個人提供測量數(shù)據(jù)還解釋了使用的設(shè)備和獲取數(shù)據(jù)的原理。
“由于氣候變化是一個全球性問題，慕尼黑網(wǎng)絡(luò)應(yīng)該只是步，”Chen說道。未來，她的團(tuán)隊將利用現(xiàn)有溫室氣體衛(wèi)星的測量數(shù)據(jù)在全球范圍內(nèi)擴(kuò)展在慕尼黑開發(fā)的方法和模型從而為理解和解決氣候問題做出決定性貢獻(xiàn)。
A20B-1000-0500/01A
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