2 Phd Positions

vor 2 Monaten

Bremen, Deutschland Universität Bremen Vollzeit

Institute of Environmental Physics

Fachbereich 1 - Physik / Elektrotechnik

**Entgelt
- / Besoldungsgruppe E 13 - **Teilzeit 75%**
**Kennziffer**: A140-24
**Bewerbungsfrist**: 05.04.2024
Öffentliche Ausschreibung

The Institute of Environmental Physics at the University of Bremen is offering at the earliest possible date a

**2 PhD positions for 3-years (f/m/d)**
**German federal pay scale E13 TV-L (75 %)**
(in accordance with - 2 WisszeitVG) in the research area
- **Satellite Remote Sensing of Sea Ice**
as part of the
- Transregional Collaborative Research Centre TR 172
- **“(AC)3 - Arctic Amplification: Climate Relevant Atmospheric and Surface Processes and Feedback Mechanisms”**

Stellenbeschreibung

The department “Remote Sensing” of the Institute of Environmental Physics (IUP) of the University of Bremen is among the leading scientific institutions in the area of satellite remote sensing of atmospheric trace and greenhouse gases and sea ice in polar regions.

**Work content**
- PhD 1, project C01: Regional and Arctic-wide changes in melt pond fraction and sea ice albedo during recent decades and its connection to Arctic Amplification_

**Hypothesis**: Changing sea ice properties and associated radiative fluxes enhance Arctic amplification.

Satellite observations are used to evaluate surface albedo on regional and Arctic-wide spatial scales. The strongest changes in sea ice albedo are caused by melt ponds during summer. An existing melt pond and albedo satellite retrieval will be applied to current and previous satellite sensors to create a long-term (>20 years) dataset that can be analyzed regarding its impact on Arctic amplification. Processes that influence the sub-footprint scale albedo and melt pond fraction variability like surface roughness and associated ice types will be evaluated by in-situ observations obtained during the year-long MOSAiC sea ice drift expedition. Based on the obtained process understanding melt pond schemes for coupled ocean-ice-atmosphere climate models will be improved together with project partners.
- PhD 2, project D03: Impact of thinner and less compact sea ice on sea ice dynamics and Arctic amplification_

**Hypothesis**: Enhanced sea-ice dynamics, and thinner ice thickness contribute significantly to Arctic amplification.

Satellite data will be used together with model simulation from project partners to answer how the observed changes in sea-ice dynamics and sea-ice thinning impact Arctic amplification. Based on existing methods an Arctic-wide data set of lead fraction from Sentinal-1 SAR will be developed. It will be combined with lead fraction datasets from MODIS infrared satellite data, ice thickness, ridge height and spacing from ICESat-2 data, and sea ice drift and deformation from Sentinel-1 SAR data. It will be analyzed how changes in ice drift and deformation impact the ice thickness, lead fraction and ridge distribution an vice versa. To answer the question, how are sea-ice dynamics affected by changing lead fraction and thinner sea ice? The impact on Arctic amplification will be analyzed in addition with a regional coupled ocean-ice-atmosphere climate model.

Both positions will be part of the research group for “Remote Sensing of Polar Regions” under the supervision of Dr. Gunnar Spreen.

Voraussetzungen
- Completed scientific university degree (Master's/University Diploma) or equivalent in physics, oceanography, meteorology, remote sensing, geophysics, or related fields.
- Skills in scientific computer programming (e.g., Python, Julia, Matlab or similar)
- A strong interest to work in the field of satellite remote sensing
- Expertise in polar or sea ice research will be viewed favorable.
- Excellent English language skills, both written and spoken.

**If you are interested in**
- working in climate research and on one of the most challenging research questions, the understanding of the Arctic climate system,
- being part of an international and interdisciplinary team and yet are able to conduct independent research,
- improving your skills in satellite remote sensing and think that it is one of the key tools to improve our climate system understanding,
- being part of a cohort of about 30 Ph.D. students within a Research Training Group distributed over five of the top German climate research institutes,
- experiencing the thriving and lively city of Bremen in north of Germany,

Allgemeine Hinweise

The Institute of Environmental Physics (IUP) provides a stimulating, international, and pleasant work environment and is strongly involved in the international climate and space science community. The focus of our work is the investigation of the atmosphere, the cryosphere, and the oceans. We have state-of-the art lab equipment, and high computational capacity, which is essential for the data processing of our satellite projects.

The University of Bremen is family-friendly, diverse and sees itself as an international university. We therefore we

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