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Atmospheric Chemistry and Physics

Technical note: LIMS observations of lower stratospheric ozone in the southern polar springtime of 1978

The Nimbus 7 limb infrared monitor of the stratosphere (LIMS) instrument operated from October 25, 1978, through May 28, 1979. This note focuses on the lower stratosphere of the southern hemisphere, subpolar regions in relation to the position of the polar vortex. Both LIMS ozone and nitric acid show reductions within the edge of the polar vortex at 46 hPa near 60° S from late October through mid-November 1978, indicating that there was a chemical loss of Antarctic ozone some weeks earlier.


Climate of the Past

Terrestrial methane emissions from the Last Glacial Maximum to the preindustrial period

We investigate the changes in natural methane emissions between the Last Glacial Maximum and preindustrial periods with a methane-enabled version of MPI-ESM. We consider all natural sources of methane except for emissions from wild animals and geological sources. Changes are dominated by changes in tropical wetland emissions, high-latitude wetlands play a secondary role, and all other natural sources are of minor importance. We explain the changes in ice core methane by methane emissions only.


Atmospheric Chemistry and Physics

Methane emissions from the Munich Oktoberfest

We demonstrate for the first time that large festivals can be significant methane sources, though they are not included in emission inventories. We combined in situ measurements with a Gaussian plume model to determine the Oktoberfest emissions and show that they are not due solely to human biogenic emissions, but are instead primarily fossil fuel related. Our study provides the foundation to develop reduction policies for such events and new pathways to mitigate fossil fuel methane emissions.


Atmospheric Chemistry and Physics

Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks

Cloud water content and the number of droplets inside clouds covary with boundary layer depth. This covariation may amplify the change in water content due to a change in droplet number inferred from long-term observations. Taking this into account shows that the change in water content for increased droplet number in observations and high-resolution simulations agrees in shallow boundary layers. Meanwhile, deep boundary layers are under-sampled in process-scale simulations and observations.


Latest posts from EGU blogs

Trying out the virtual #EGU20 (spoiler: we made it, so should you!)

Trying out the virtual #EGU20 (spoiler: we made it, so should you!)

Firstly, we hope that all of you, as well as your relatives, are staying healthy and safe at home. COVID-19 has spread around the planet, sending billions of people into lockdown. We are sure that we can overcome this crisis by supporting each other and making our best with our individual actions. As you have probably noticed, the physical EGU General Assembly 2020 has been officially cancelled. During the last month, many questions about the EGU’s perspective and actions have …


#shareEGU20: uploading your materials, a webinar and walk-through

#shareEGU20: uploading your materials, a webinar and walk-through

Due to the ongoing coronavirus outbreak, EGU has made the decision to cancel this year’s physical General Assembly in Vienna and instead offer a partial alternative meeting online, called #shareEGU20. Over the next few weeks in the run up to #shareEGU20, which will be held from the 4 – 8 May 2020, we will be posting regular updates and information about how to get involved, what EGU can offer during this week and how to find each other. We know …


The challenges (and the perks) of being academic nomads

The challenges (and the perks) of being academic nomads

It has become inevitable for scientists to move abroad for their jobs. Moving to and living in a new country can be a very exciting, yet also tough experience. In today’s blog post, Irene Bonati (PhD Student at the Earth-Life Science Institute, Tokyo) discusses the challenges and perks that come with the nomad lifestyle of many academics. Research provides a kind of freedom that almost no other job can give. We get to choose the topic we want to investigate, …