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2012 Expedition Timeline
Expeditions
Winter Sampling
What Are They Doing?
Expedition Map
Weddell Seals in the Ross Sea
What Are They Doing?
The research team was interested in learning more about Weddell seals by studying how they dive and forage for food during the winter, when days are shorter and there is more sea ice cover. They were also interested in collecting oceanographic data, such as water temperature and salinity.
The research team collected this information by traveling to places where Weddell seals were hauled out on the sea ice, and briefly capturing them. Once they captured a seal, they conducted an exam in order to determine its health and condition. The researchers also put a satellite-linked dive recorder on each seal that they captured. These devices transmit data showing where, how often, and how deep the seals are diving. In addition, the devices record the temperature and salinity of the water where seals are diving.
Currently there is not a lot of information about how Weddell seals find food during the winter. Without this information, it is difficult to predict how seals will respond to changing environmental conditions. By using the seals to collect ocean data, the team has collected important information which is used to develop models to predict the role of the Southern Ocean in global climate processes.
Expedition Map
Seafloor Organisms and Changing Ocean Conditions in Antarctic
What Are They Doing?
This project studied the effects of rising ocean acidification and temperatures on seafloor dwelling animals in the shallow waters of Antarctica. Carbon moves around the earth, between land, atmosphere, and water in the carbon cycle. The ocean absorbs Carbon Dioxide (CO2) from the Earth’s atmosphere. As increasing amounts of Carbon Dioxide are absorbed, the pH of the water is decreasing or becoming more acidic. This is called ocean acidification.
Several marine animals, such as mussels, snails, sea urchins, and more use the naturally occurring calcium (Ca) and carbonate (CO3) in seawater to construct their shells or skeletons. As seawater becomes more acidic, carbonate becomes less available, which makes it more difficult for these organisms to form their skeletal material. This negatively affects the health of the animal in many different ways.
In Antarctica, it is predicted that water temperatures will increase and the calcium carbonate needed by these organisms will decrease. Being sensitive to small changes in water temperatures and unable to form adequate shells and skeletons, many of these animals may have declined in health. Understanding how these small animals will react to changing ocean conditions is important, as several larger animals rely on them as a food source.
To collect their data, SCUBA divers dived to the seafloor and collected organisms. The research team ran several experiments on the animals to see how they would respond to changes in water acidification and temperature.
Expedition Map
Impacts of the Larsen Ice Shelf System on the Weddell Sea
What Are They Doing?
The overarching goal of the LARISSA (LARsen Ice Shelf System, Antarctica) project was to describe and understand the basic physical, geological, and biological processes active in the Larsen embayment that contributed to the present phase of massive, rapid environmental change. Dr. Vernet's research group worked to determine abundance, diversity, and production of marine phytoplankton in the Larsen B region. The team used shipboard samplers and moored sediment traps to sample from the water column up to depths of approximately 600 m. They did this to determine how much production is supported in the region, its distribution in space and time, and how the organic matter transfers into higher trophic levels and reaches the sediments. Time onboard the ship was spent selecting sampling locations, collecting water, filtering samples for analysis, and analyzing samples on board. They also collected water to isolate diatom species and brought them back to the lab for further experimentation. Results from this research allowed scientists to predict the likely consequences on marine ecosystems of ice-shelf collapse in other regions of Antarctica vulnerable to climate change.
Expedition Map
Airborne Survey of Polar Ice
What Are They Doing?
Operation IceBridge began in 2009 to bridge the gap in data collection after NASA's ICESat-1 satellite stopped functioning and when the ICESat-2 satellite becomes operational in 2016, making IceBridge critical for ensuring a continuous series of observations in the Arctic. IceBridge flies over these regions to map Arctic areas once a year. By comparing the year-to-year readings of ice thickness and movement both on land and on the sea, scientists can take a yearly look at the behavior of the rapidly changing features of the Greenland ice and learn more about the trends that could affect sea-level rise and climate change around the globe.
Expedition Map
Nutrient Transport in Arctic Watersheds
What Are They Doing?
Since the flowpaths connecting terrestrial ecosystems to stream networks remain poorly understood, the group focused on transport and reaction of water and solutes within water tracks, which are linear regions of surface and subsurface flow that connect hillslopes to streams and account for up to 35% of watershed area in arctic tundra. The research increased our understanding of the role of hillslopes in connecting terrestrial ecosystems to stream networks.
Expedition Map
Tundra Nutrient Seasonality
What Are They Doing?
Since nutrient cycling on the tundra changes throughout the season, the research team worked to understand how seasonal changes in tundra plants and soil dynamics are affected by changes in the timing of snowmelt and warming. By experimentally manipulating factors such as the timing of spring thaw and fall freeze directly on the tundra, the team could study how this affects the ecosystem directly. The team was engaged in a mixture of outdoor field sampling, experimentation, and laboratory work. Through this research, the team aimed to better predict the impacts of changing growing season timing and duration on the carbon balance of arctic ecosystems.
Expedition Map
Predatory Spiders in the Arctic Food Web
What Are They Doing?
For example, In the Alaskan Arctic, wolf spiders are the largest and most abundant invertebrate predators. A shift in their ecological role could therefore have an important impact on the entire food web. Evidence from Arctic Greenland shows that wolf spider body sizes are becoming larger in response to longer growing seasons. These increases in body size will likely lead to larger spider populations, which could imply an increase in predation on the rest of the community.
This project explored the role of wolf spiders within arctic communities and specifically, whether climate change is stimulating changes in these predators that could influence the structure and functions of arctic food webs. The research team used a variety of methods to examine the impact of wolf spiders, including sampling spiders from various locations around Toolik Lake and carrying out a manipulative experiment that looked at the entire food web.
Expedition Map
Greenland Education Tour 2012
What Are They Doing?
The 2012 expedition's work built on past expeditions and was supported by the National Science Foundation. The project was developed through cooperation with the U.S.-Denmark-Greenland Joint Committee, which was established in 2004 to broaden and deepen cooperation among the United States, the Kingdom of Denmark, and Greenland.
The program had two components.
Kangerlussuaq Science Field School: 29 June - 12 July 2012
US Science Education Week: 12- 22 July 2012
Expedition Map
Siberian Arctic Systems Study
What Are They Doing?
Expedition Map
Microbial Activity in Thawing Arctic Permafrost 2012
What Are They Doing?
To collect their data, the research team combined research methods from biology, ecology, and biotechnology. In 2012, the team performed experiments to determine the role that bacterial processes play in the production of carbon dioxide, methane, and other gases from peat soils. They collected data in the field including gas flux measurements, soil cores, thaw depth, water table depth, pH, and dissolved oxygen content. Additionally, they monitored bacterial respiration and conducted related lab experiments.
Expedition Map
Carbon Balance in Warming and Drying Tundra 2012
What Are They Doing?
The research team studied changes to the carbon cycle in northern forests by setting up experiments that simulate a warmer and dryer tundra. When they arrived at the field site they first removed snow from the research sites and then set up an automated carbon dioxide measurement system and warming chambers. After the set-up, the team took field measurements of carbon dioxide exchange between the soil and atmosphere, permafrost thaw depth, and water table depth. In addition, they took plant and soil samples and studied the timing of plant life events, also known as phenology. In 2012, the team also took methane and radiocarbon measurements.
The experiment was part of the Carbon in Permafrost Experimental Heating Research (CiPEHR) project. The results of their research will help in predicting how the warming and drying tundra will affect the carbon balance, and how the release of additional carbon dioxide will affect global climate change.
Expedition Map
Early Human Settlement in Arctic Alaska 2012
What Are They Doing?
The site also contains fluted projectile points – a type of stone spear tip that is associated with many of the earliest archaeological sites in the continental United States. Fluted projectile points have been found throughout the Americas, but have never been reliably dated in Alaska. Because people migrated from north-to-south after entering the Americas from Asia across the Bering Land Bridge, fluted points in the far north are expected to be older than the fluted projectile points found in the continental United States. However, initial findings from Raven Bluff indicate that the fluted projectile points at this site are actually younger than the oldest fluted projectile points in the continental United States. By dating these artifacts, the research team is studying the nature and timing of early human population movements in the Americas.
In addition to providing information on early human settlement patterns, the animal remains from this site may shed light on the long term history of caribou populations in what is now the home of the western arctic caribou herd, a resource of critical importance to local residents and a key issue of concern for biologists and wildlife managers.
Expedition Map
High Arctic Change 2012
What Are They Doing?
The team investigated how high latitude glaciers, melt-water streams, and sedimentation in lakes and fjords respond to changing climate conditions. The Svalbard region has been marked by the retreat of glaciers, reductions in sea ice, and measurable warming during the past 12,000 years, and more specifically during the last 90 years. Svalbard's high latitude location, its location at the end of the Gulf Stream, combined with its relatively easy access, makes it an ideal location for this study. Svalbard has an arctic climate and is home to many large glaciers, including alpine glaciers in the mountains, and tidewater glaciers that end in long narrow bodies of seawater called fjords. The region is ideal for the study of past climate because the Arctic is highly sensitive to changes in climate and several different types of measurements on and around glaciers can be conducted there.
Expedition Map
Ecosystem Study of the Chukchi Shoal
What Are They Doing?
Previous work in the area has profiled the biogeochemistry of the northern Chuckhi Sea, but this study focused more particularly on the Hanna Shoal region, looking at phytoplankton and zooplankton in the open ocean as well as the physical oceanography through direct measurement of circulation, density fields, and ice conditions.
Expedition Map
Oceanographic Conditions of Bowhead Whale Habitat
What Are They Doing?
¿Quienes son?
Titulo financiado: Observación anual del medio ambiente marino biológico y físico en los mares Chukchi y Beauford en las cercanías de Barrow, AK.
El equipo de investigación viajará por avión a Barrow, una comunidad pequeña de aproximadamente 4,500 habitantes en la costa norte de Alaska. Como permitan las condiciones del tiempo, el equipo se embarcara para la colección de muestras oceanográficas a bordo del buque de investigación Annika Marie de 43 pies. Las actividades de a bordo incluirán colección de agua y plancton y mediciones de conductividad, temperatura, y profundidad. A bordo también tomarán nota sobre las ocurrencias de mamíferos marinos y realizarán el procesamiento preliminar de muestras. Si el clima es malo para navegar en el océano ellos pasarán el tiempo en Barrow catalogando muestras y organizándose para los días que pasaran sobre el agua.
Expedition Map
Russian American Long term Census of the Arctic
What Are They Doing?
These seas and the life within them are biologically rich and are thought to be particularly sensitive to global climate change because they are in areas where steep thermohaline and nutrient gradients in the ocean coincide with steep thermal gradients in the atmosphere. The Bering Strait acts as the only Pacific gateway into and out of the Arctic Ocean and as such is critical for the flux of heat between the Arctic and the rest of the world. One of the overall goals of the entire project was to monitor the flux of fresh and salt water in the region and to establish benchmark information about the distribution and migration patterns of the biologically rich life in these seas. Dr. Grebmeier's research on this final cruise of the project was particularly focused on benthic biological communities and their associated sediment chemistry.
Expedition Map
Tectonic History of the Transantarctic Mountains
What Are They Doing?
The goal of this project, funded by the National Science Foundation, was to broaden our knowledge of geology in this region with a new seismic project; the Transantarctic Mountains Northern Network (TAMNNET), a 15-station array across the northern TAMs and the WSB that will fill a major gap in seismic coverage. Data from TAMNNET was combined with that from previous and ongoing seismic initiatives and was analyzed to generate an image of the seismic structure beneath the TAMs and the WSB.
While in the field, the team spent most of their time deploying seismic stations that compose the new TAMNNET array. This included loading equipment onto small airplanes, flying to remote field locations, digging large holes in the snow/ice to shelter the equipment, and assembling and testing the seismic hardware.
Expedition Map
Space Weather Monitoring on the Antarctic Plateau 2013
What Are They Doing?
To do this, scientists created Automatic Geophysical Observatories (AGOs) that are active at five locations established across the Antarctic Plateau that house nearly identical instruments measuring atmospheric weather conditions. During their stay, the team made sure all of the different instruments were working properly and collecting reliable data. Supporting these observatories is crucial to the study of interactions between the magnetic fields of the Sun and of the Earth. Learning more can help us understand the potential disturbances in these fields that can disrupt radio communications or our power systems, and even take out satellites that orbit close to Earth.
Expedition Map
Buried Ice in Antarctica 2012
What Are They Doing?
In addition to drilling for ancient ice, the team worked in the Dry Valleys to seek a better understanding of surface processes that play a critical role in maintaining and/or modifying buried glacier ice. Despite their age and potential to register long-term climate change, there has been surprisingly little research on the geologic and geomorphologic processes that both preserve and modify debris-covered glaciers in Antarctica. In addition, the cold polar desert of the Dry Valleys is one of the most Mars-like climatic environments and landscapes on Earth, serving as a proxy for very ancient ice buried on Mars and providing insight into Martian history and the potential for life on Mars.
Expedition Map
IceCube In Ice Antarctic Telescope 2012
What Are They Doing?
IceCube is located in Antarctica because the huge amount of dense ice under the South Pole contains many protons that can be hit by passing neutrinos, and the ice is transparent, so the resulting light can be detected by sensors. IceCube is made up of 4200 sensitive light detectors embedded in the ice at depths between 1450 and 2450 meters (4700-8000 feet). The sensors are deployed on "strings" of 60 modules each, into holes 60 cm in diameter in the ice melted using a hot-water drill. Encompassing a cubic kilometer of ice, IceCube expands on an existing experiment that started detecting neutrinos at the South Pole in 1997. When IceCube is complete, it may detect up to 300,000 neutrinos a year for up to 20 years.
The data collected will be used to make a "neutrino map" of the universe and to learn more about astronomical phenomena, like gamma-ray bursts, black holes, exploding stars, and other aspects of nuclear and particle physics. However, the true potential of IceCube is discovery; the opening of each new astronomical window has led to unexpected discoveries.