Biogeosciences

Investigation of methane emissions in marine systems

Jasper Bloemen September 17, 2017

Carbonate crust sampled by the ROV (credit: Maja Sojtaric - CAGE).

Ever wondered how we can measure methane emssions from the seafloor ? And ever wanted to steer a mini submarine remotely operating vehicle (ROV)? Well here´s your chance! Have look at this blog post on analyzing methane emissions using ROVs and you´re ready to embark! The goal is to determine when the gas leak started and how the fluid flow systems work. With our research, we can contribut ...[Read More]

Coffee break biogeosciences–high resolution δ18O record from bivalves

Rachael Moore December 9, 2016

Arctica islandica from the North Sea. Image: © Hans Hillewaert used under CC BY-SA 4.0.

Much like trees, clam shells have growth rings. The chemistry of these rings can be used as a proxy for ocean chemistry. Recently, an international team of scientists used the growth rings found in shells of Arctica islandica to produce an annual absolutely dated marine δ18O record for the last millennium which was published in Nature Communications. The record represents the first fine scale arch ...[Read More]

Coffee break biogeosciences–in situ sub-millimeter scale resolution imaging of benthic environments

Rachael Moore August 5, 2016

The BUM in action in Maui (Jaffe Lab for Underwater Imaging, Scripps Institution of Oceanography at UC San Diego)

Coral reefs and other benthic marine ecosystems play a very important role in the biogeochemical cycles of our oceans. However, laboratory based study of these environments ranges from being difficult to actually impossible. In order to look at the microscopic-scale processes that occur in the benthic environment a team of scientists developed the Benthic Underwater Microscope (BUM). The device, w ...[Read More]

What´s in your fieldbag? Part 1: measuring freshwater carbon fluxes in the Artic

Jasper Bloemen July 27, 2016

How to pack light for a trip to the Siberian Arctic (photo credit: Joshua F. Dean, VU Amsterdam).

This bag belongs to Joshua Dean, Postdoc, Vrije Universiteit Amsterdam Field Work location Far Eastern Siberian Arctic: Kytalyk Nature Reserve. Duration of field work 2 weeks plus 3 days travel either side. Items in the bag Detecto Pak-Infrared (DP-IR) gas analyser [borrowed from colleagues, protect at all costs] EGM4 CO2 gas analyser [borrowed from another department, protect at all costs] water ...[Read More]

Coffee break biogeosciences – climate change affects mountain plant’s sex ratios

Jasper Bloemen July 22, 2016

A recent study shows that the effect of climate change on mountain plants ( Valeriana edulis in the picture) is strongly dependent on plant sex (Photo credit: Will Petry).

As climate change progresses, widespread changes in phenotypes in many plant populations are bing observed by scientists around the world. For instance in alpine areas, dominant plant species on lower altitude are shifting towards higher altitude as they adapt to increasing temperatures, thereby competing with high-altitude native plant species. In a recent study by Petry et al. (2016) it was show ...[Read More]

Coffee break biogeosciences–The oldest known fossilized active root meristem

Rachael Moore July 1, 2016

Radix carbonica is the oldest known fossilized remains of root meristem which was actively growing at time of fossilization. (Image credit: Alexander (Sandy) Hetherington of slide number 81 with the permission of the Oxford University Herbaria).

Meristems are groups of undifferentiated cells found in growth zones of plants. Active meristem zones have a different cellular organization than inactive zones, and up until recently no fossilized active root meristem had been found. A team of scientists recently found and described the fossilized remains of an actively growing root meristem dating from the Carboniferous. The fossil, named Radix ...[Read More]

Keeping a lookout at the edge of the world

Jasper Bloemen June 10, 2016

One of the last sunsets over the Kytalyk research station in the Siberian Arctic before 24-hour daylight sets in, and the Spring thaw begins (photo credit: Joshua F. Dean).

Few places in the world conjure up images of remoteness and harshness like Far Eastern Siberia. Yet, it’s places like these where our science is needed most. Arctic soils hold vast amount of carbon, protected in thick layers of permafrost, but these stores are becoming more and more vulnerable as temperatures in the Arctic warm, and are set to warm faster than anywhere else on the planet. R ...[Read More]

Coffee break biogeosciences–Urban bees found to feed on flowers

Rachael Moore June 2, 2016

The food source of urban bees was found to be city flowers rather than a man-made sugar source (Image credit: Lauren Nichols).

Honey bees, a highly important pollinator, have suffered a number of declines and population collapses in recent years. The growth of urban centers has contributed to a loss of foraging habitat and an introduction of new food sources. A recent study conducted across the rural-urban boundary of Raleigh, North Carolina, USA examined the feeding sources of urban and rural honey bees using δ13C measur ...[Read More]

Coffee break biogeosciences – New coral reef at Amazon river mouth discovered

Jasper Bloemen May 20, 2016

Scientists were surprised to discover the coral reef in the muddy waters at the mouth of the river Amazon (Photo credit: Nasa)

At the Amazon river mouth, a huge 9,300 sq km coral reef system has been found below the muddy waters off the mouth of the river Amazon. As corals mostly thrive in clear, sunlit, salt water, and the waters near the mouth of the Amazon are some of the muddiest in the world, the discovery of this almost 2000 km long reef leaves scientists puzzled about the potential extent of coral reefs worldwide. ...[Read More]

General assembly 2016: our session picks

Jasper Bloemen April 14, 2016

EGU GA 2016 is only three days away! Here you can find our session picks!

Whether you’re an experienced attendee of the EGU GA, or this is your first time there are always things to look out for, it is always worth attending your division’s division meeting, one of the great debates, and keep an eye out for short courses which may be of interest to you. Here are the recommendations from the Biogeosciences Blogging team: The BG division meeting is Thursday from 12:15-13: ...[Read More]