the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Estimation of elevated black carbon episode over Ukraine using Enviro-HIRLAM
- 1Ukrainian Hydrometeorological Institute (UHMI), Kyiv, 03028, Ukraine
- 2Institute for Atmospheric and Earth System Research (INAR), Faculty of Science, Physics/University of Helsinki (UHEL), Helsinki, 00560, Finland
- 1Ukrainian Hydrometeorological Institute (UHMI), Kyiv, 03028, Ukraine
- 2Institute for Atmospheric and Earth System Research (INAR), Faculty of Science, Physics/University of Helsinki (UHEL), Helsinki, 00560, Finland
Abstract. Biomass burning is one of the biggest sources of black carbon concentrations which negatively impacts human health and contribute to climate forcing. In this work we explore horizontal and vertical variability of black carbon concentrations over Ukraine during a wildfire episode in August 2010. Using Enviro-HIRLAM modelling framework the black carbon atmospheric transport was modelled for coarse and accumulation mode aerosol particles emitted by the wildfire. Elevated pollution levels were observed within the boundary layer. The influence of the black carbon emissions by the wildfire was identified up to 550 hPa level and at distances of about 2000 km from the fire areas. Strong temperature inversions at nighttime resulted in subsiding air mass movement and lead to increased concentrations of black carbon in the atmospheric boundary layer. Ground-based measurements of dust showed increase of concentration up to 73 % in comparison to average values. The fingerprint of local fires was found in the areas with local maxima of summary black carbon values for coarse mode. The findings of the case study could help to understand the behaviour of black carbon distribution during anticyclonic conditions which often observed in mid-latitudes in the summer and lead to wildfires occurrence.
Mykhailo Savenets et al.
Status: final response (author comments only)
-
RC1: 'Comment on acp-2022-103', Anonymous Referee #1, 18 Mar 2022
This is a modelling study about black carbon particles but without any validation from measurements, at least some ground measurements of BC are required. The modelling setup is too rough. Not just that, but all the presentation throughout the texts shows the authors have not really performed any meaningful data analysis.
Is the unit of BC concentration in ppbm? What is ppbm by the way.
There are a number of places using quotation marks when referencing. You need to extract the key relevant information and write down in your own way rather than using the original words and quotation marks.
The quality of figures needs large improvement.
What is the size fraction of PM10, did you use the mass concentration of PM10 or PM10 minus PM2.5. The measurement needs to be explicitly given. Also how you have defined the PM10 is necessarily dust.
For modelling, a description of anthropogenic emission inventory you used is needed.
Fig. 7 is simply part of the open biomass burning emission inventory used (the burn area fraction), not footprint.
Overall, this manuscript is not qualified for commenting in details.
-
RC2: 'Comment on acp-2022-103', Anonymous Referee #2, 25 Mar 2022
The authors estimated the elevated black carbon (BC) levels in temporal and three-dimensional spatial scales after the forest fire events occurred in summer 2010 at the center of the European territory of Russia. Throughout the manuscript, the writing, however, appears somewhat rambling, especially for the ‘Results and discussion” section. The authors should give more discussion and interpretation for their results. The authors need to explain exactly what the novel insights of their work are, and how their finding are relevant to atmospheric chemistry and radiative transfer. Especially compared with the earlier works that investigated the forest fire events occurred in summer 2010, the authors could state what questions had been left open, and what the present paper now addresses.
General Comments:
The authors claimed that the work focused on the horizontal and vertical variability of BC concentrations over Ukraine during a wildfire episode in August 2010. However, the author just presented the BC concentrations after the forest fire evens, not comparing with BC levels before the wildfire evens; how to demonstrate that the BC levels were elevated? Additionally, the authors should valid their simulations of BC concentrations. Could they provide some BC measurements rather than dust observations to verify their simulations, and discussed the uncertainties of the simulations. The authors claimed that the features of BC distributions that they presented in this work not only resulted from biomass burning, but also were affected by the local sources of fires. Could they estimate how much the influence?
Specific comments:
Overall, the paper is rather poorly written with many grammar/ formatting mistakes. Some simple things, such as the superscripts and subscripts of “PM10” “PM2.5” and “µg/m3” (several times), inconsistent format of the figure legends (font size and line space (caring Figure 1), font bold (caring Figure 2)). These mistakes indicate that proper care was not taken to proofread the paper prior to submission.
Figure 2 is from the Climate Forecast System (CFS) Reanalysis (source: www.wetterzentrale.de). It can be shown in the Supporting Information.
The “3.1 Synoptic weather situation during summer 2010 in Ukraine” just has one paragraph, which can be combined with the “3.2 Dispersion of wildfire emissions”.
Page 7 /Line 160-164: The authors discussed the horizontal distribution of BC concentrations not only in the accumulation mode but also in the coarse mode. However, the authors only showed the BC distribution in the accumulation mode in Figure 3. Why not present the simulations of coarse mode.
Page 9 /Line 195: The authors highlighted that the elevated BC concentrations were detected at 590 hPa (for the coarse mode) and at 550 hPa (for the accumulation mode). However, Figure 5 shows that the BC concentrations were very low with values near 0 in the <650 hPa layers. Could the authors clear how they identify the elevated BC concentrations at 590 hPa (for the coarse mode) and at 550 hPa (for the accumulation mode).
Page 10 /Line 219-225: This paragraph introduced how to process the ground-based dust measurements. It should be in the “Data and methods” rather than the “Results and discussion”.
Page 11 /Line 239-241: The two sentences are confusing and needs to be reworded.
Page 12 /Line 255-259: The authors discussed the “trails” of the BC distribution in the coarse mode, attributing to atmospheric transport and the impact of local fires. Why the BC distribution in accumulation mode did not present “trail” feature. How the effects of the atmospheric transport and local fires on the BC distribution in the accumulation mode?
Conclusions: The authors need to clear the novel insights of their work and the significance of their finding.
Mykhailo Savenets et al.
Mykhailo Savenets et al.
Viewed
| HTML | XML | Total | BibTeX | EndNote | |
|---|---|---|---|---|---|
| 267 | 61 | 7 | 335 | 4 | 5 |
- HTML: 267
- PDF: 61
- XML: 7
- Total: 335
- BibTeX: 4
- EndNote: 5
Viewed (geographical distribution)
| Country | # | Views | % |
|---|
| Total: | 0 |
| HTML: | 0 |
| PDF: | 0 |
| XML: | 0 |
- 1