The Role of Mission-Specific Platforms in IODP
Since the start of the Integrated Ocean Drilling Program (IODP) in 2003, the ambitious expansion of scientific exploration beneath the oceans has been made possible by the increased drilling capability provided by multi-platform operations. The Implementing Organisation in Europe, ESO (ECORD Science Operator), which conducts mission-specific platforms (MSPs) for the IODP has carried out seven expeditions: in the ice-covered waters of the Arctic; the shallow waters around Tahiti, the Chicxulub impact crater and off the coasts of New Jersey (USA), the Australian Great Barrier Reef, the Baltic Sea and the mid-Atlantic Ocean (Atlantis Massif). But what is a mission-specific platform and how does it differ from other IODP platforms?
What is a Mission-Specific Platform?
Whereas the US and Japanese ships, JOIDES Resolution and Chikyu, are dedicated drilling vessels fitted out with permanent drilling, laboratory and offshore core repository facilities, MSPs are platforms especially chosen to fulfil particular scientific objectives. In most cases this requires modifications to the most appropriate platform (which may be a ship, drilling rig, etc).
Due to the time required to identify, contract and modify the most suitable platform, scientists selected for MSP expeditions need to have a flexible approach to their timing and participation. Whereas other drillships have expedition schedules agreed sometimes years in advance, the date that any MSP expedition starts can vary. The schedule may change at relatively short notice because of unforeseen delays in the platforms commitments prior to coming on contract, to technical challenges connected with fitting out the platform or to adverse weather conditions.
The end of the expedition is also dependent on several factors, for example, if the cost of fuel rises during the contracting and planning phase, relatively less funding will be available for drilling operations.
Onboard the Mission-Specific Platform
Scientists arriving to take part in an MSP expedition will notice a difference in conditions onboard the platform. Unlike the 143-metre JOIDES Resolution or the 210-metre Chikyu, MSPs are smaller platforms, such as the DP Hunter used in Tahiti, which is 104 metres long.
The restrictions onboard the vessel require flexible planning, both by scientists and drilling technicians. A limited number of mobile containers are provided and equipped for core curation and some laboratory facilities. ESO carries the equipment necessary to conduct IODP minimum measurements. An overview of the equipment normally available offshore, or has been used on previous MSP expeditions, is available at the Bremen Core Repository website.
Comprehensive scientific analyses on the sediment cores are carried out during the onshore phase of the MSP, which takes place several months after the offshore operations have been completed. Consequently, only a few researchers and technicians, under the guidance of the Co-chief Scientists, are needed during the offshore phase. The small offshore team may have to help out on a range of scientific tasks to ensure that the essential work of capturing ephemeral measurements (ie measurements that have to be taken shortly after the core is collected) are completed.
Taking these factors into account, there is clear difference between MSPs and other IODP expeditions in that there is the need to have an onshore science party (OSP) following the drilling phase. The OSP is the real science party, not merely a sampling party.
The Onshore Science Party (OSP)
The Onshore Science Party (OSP) takes place after the offshore operations are completed. The cores are transferred to Bremen Core Repository (BCR) located at the University of Bremen in Germany, one of three IODP core repositories worldwide.
At the OSP, cores are split and scientists have their first opportunity to study the cores in detail, as they have access to the full laboratory facilities of the BCR. An essential requirement of the OSP is that scientists stay at the core repository until all core descriptions, initial measurements (the so-called IODP minimum measurements, and some IODP standard measurements), and report writing have been completed.
The end of the OSP is the equivalent of coming off an IODP drillship. The entire invited expedition science party are required to attend the OSP and participants are asked to be flexible in their attitude to start and end dates. The start times may be influenced by any changes in the timing of the offshore phase, but the OSP normally takes place within 3-4 months of the end of the offshore operations. The duration of the OSP is in part dependent on the quantity of core collected.
The core flow procedures at the Onshore Science Party are described at the MARUM website.