Uzaktan algılama verileri ile orman yangınlarında yanma şiddetinin ve hava kirleticilerinin izlenmesi: 2021 yazı Mersin orman yangınları örneği

Year 2022, Volume: 12 Issue: 2, 487 - 497, 15.04.2022

Muzaffer Can İban , Ezgi Şahin

https://doi.org/10.17714/gumusfenbil.1008242

Cited By: 6

Abstract

Hava kirleticilerini, madde zehirliliğini, arazi örtüsü değişimini ve yanma şiddetini izlemek için uzaktan algılama verilerinden faydalanan çalışmalar yapılmaktadır. Bu çalışmanın amacı, Mersin İli’nde 28 Temmuz – 3 Ağustos 2021 tarihleri arasında gerçekleşen orman yangınları sonucunda gözlemlenen arazi örtüsü ve atmosfer verilerini analiz etmektir. Yangın öncesi (20-27 Temmuz), yangın (28 Temmuz-3 Ağustos) ve yangın sonrası (4-10 Ağustos) dönemleri için çeşitli açık erişimli uzaktan algılama verileri (MODIS, Sentinel 2A ve Sentinel 5P) kullanılan bu çalışmanın bulguları iki kategoride belirtilebilir. İlk kategori, etkilenen bölgenin arazi yüzey sıcaklığı ve yanık şiddeti haritalarının hazırlanmasını ve bunların arasındaki ilişkinin karşılaştırılmasını içermektedir. İkinci kategori ise, kirletici gazların (karbon monoksit, formaldehit, sülfür dioksit ve ozon) düşey yoğunluk haritalarını içeren atmosferik çıktılardır. Bu analizlerin nicel sonuçları, yüksek şiddetli yanma alanlarının 16.536 hektara karşılık geldiğini ve maksimum düşey molekül yoğunluğunun karbon monoksit için 0.071 mol/m2, formaldehit için 0.0043 mol/m2, kükürt dioksit için 0.00049 mol/m2 ve ozon için 0.137 mol/m2'ye ulaştığını göstermektedir. Yanma şiddetinin, arazi yüzey sıcaklıkları ile yüksek oranda ilişkili olduğu saptanmıştır. Orman yangını sırasında ve sonrasında atmosferdeki kirletici seviyelerinin yükseldiğini tespit eden bu çalışma, kentsel alanların yakınında hava kirleticilerinde önemli bir artış olduğuna dair herhangi bir kanıt bulamamıştır. Ancak, ozon gazı yoğunluğunun orman yangınından sonra, il genelindeki yüksek nitrojen oksit seviyesine bağlı olarak önemli ölçüde yükseliş gösterdiği gözlemlenmiştir.

Keywords

Hava kirleticileri, Yanma şiddeti endeksi, Arazi yüzeyi sıcaklığı, Sentinel-5P, Orman yangınları

Monitoring burn severity and air pollutants in wildfire events using remote sensing data: the case of Mersin wildfires in summer 2021

Abstract

Remotely sensed data have been used to investigate air pollutants and matter toxicity, land cover changes and burn severity. The goal of this study is to analyze land and atmospheric data for wildfire events that occurred in Mersin Province between July 28 and August 3, 2021. We used a variety of open-access remotely sensed data sets (MODIS, Sentinel 2A and Sentinel 5P TROPOMI) from the pre-fire (20-27 July), fire (28 July – 3 August), and post-fire period (4-10 August). This comprehensive study's findings can be divided into two categories. The first group is the land cover output, which includes maps of the affected region's land surface temperature and burn severity, as well as comparisons of the two. The atmospheric output, which consists of trace gas column density maps (for carbon monoxide, formaldehyde, sulphur dioxide and ozone), is the second group. The quantitative results of these analyses indicate that high severity areas correspond to 16.536 hectares, and the maximum column number density reached to 0.071 mol/m2 for carbon monoxide, 0.0043 mol/m2 for formaldehyde, 0.00049 mol/m2 for sulphure dioxide and 0.137 mol/m2 for ozone. The burn severity is found to be highly correlated with land surface temperatures. Pollutant levels in the atmosphere were found to be rising during and after the wildfire. There has not been any evidence of a significant increase in air pollutants near urban areas. However, ozone concentrations rose significantly after the wildfire because the province's nitrogen oxide levels were high enough to produce ozone.

Keywords

Air pollutants, Burn severity index, Land surface temperature, Sentinel-5P, Wildfires

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