skip to main content


Title: Expedition 359 Scientific Prospectus Addendum: Sea Level, Currents, and Monsoon Evolution in the Indian Ocean
This addendum to the Expedition 359 Scientific Prospectus (Betzler et al., 2014) addresses a modification to the scientific objectives and operations plan of the expedition. After consultation with and direction from the U.S. National Science Foundation (NSF), the Ancillary Proposal 849-APL will not be implemented as part of Expedition 359, and consequently the proposed sites (KK-03A and KK-03B) originally planned for scientific drilling in the Kerala-Konkan Basin have been dropped from the operations plan. Two new sites are proposed and described in this addendum, and a revised operations strategy and time estimates for seven primary sites in the Maldives archipelago are presented (Fig. F1). Also detailed in this addendum is an extension to the total penetration depth at primary proposed Site MAL-02A from 560 to 1010 meters below seafloor (mbsf). All other details contained within the original Scientific Prospectus published by the International Ocean Discovery Program in November 2014 (Betzler et al., 2014) remain the same. A summary of the primary sites targeted for Expedition 359 is shown in Table T1. The operations strategy and time estimates for the primary sites are presented in Table T2.  more » « less
Award ID(s):
1326927
NSF-PAR ID:
10231043
Author(s) / Creator(s):
; ;
Date Published:
Journal Name:
Scientific prospectus
Volume:
359
ISSN:
2332-1385
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
More Like this
  1. null (Ed.)
    This addendum to the International Ocean Discovery Program (IODP) Expedition 383 Scientific Prospectus (Dynamics of the Pacific Antarctic Circumpolar Current; Lamy et al., 2018) addresses the results of the safety review of 10 new proposed drill sites by the IODP Environmental Protection and Safety Panel (EPSP) on 4–6 September 2018 and a change to the operations plan and the end port call for Expedition 383. Because of an adjustment to the R/V JOIDES Resolution 2018–2019 operations schedule, the end port for Expedition 383 has changed from Valparaiso, Chile, to Punta Arenas, Chile. Therefore, at the time of publication of this addendum, the expedition is scheduled to start and end in Punta Arenas, Chile. The dates of the expedition remain unchanged from the original Expedition 383 Scientific Prospectus (Lamy et al., 2018), from 20 May to 20 July 2019. The change in port reduces the distance and hence the transit time between the last drill site in the central South Pacific and the port in Chile, providing ~3 additional days for scientific drilling operations. For that reason, a new proposed primary site (CSP-7A) in the central South Pacific has been added to the original operations plan from Lamy et al. (2018), bringing the total number of primary sites planned for Expedition 383 to seven (Figures F1, F2, F3, F4). The current operations plan and time estimates include 5 days of port call activities, 38.2 days of operations, and 17.7 days of transit. 
    more » « less
  2. null (Ed.)
    This addendum to the International Ocean Discovery Program Expedition 391 Scientific Prospectus (Walvis Ridge Hotspot; Sager et al., 2020) incorporates minor coordinate changes to Proposed Sites CT-5A, CT-6A, TT-3A, TT-4A, TT-5A, VB-7A, VB-8A, VB-10A, VB-11A, VB-13A, and VB-14A. The revised site coordinates are documented in Proposal 890-Add2, which is available at http://iodp.tamu.edu/​scienceops/​expeditions/​walvis_ridge_hotspot.html. In addition, because of adjustments to the R/V JOIDES Resolution operations schedule caused by the COVID-19 pandemic, the expedition was postponed by a year. At the time of publication of this addendum, the expedition is scheduled to start in Cape Town, South Africa, on 6 December 2021 and end in Cape Town, South Africa, on 5 February 2022. For a detailed description of the geologic background, scientific objectives, drilling and coring strategy, logging strategy, sample and data sharing strategy, and proposed sites, see Tables T1 and T2 in this report and the Expedition 391 Scientific Prospectus (Sager et al., 2020). 
    more » « less
  3. null (Ed.)
    Due to the availability of new site survey data and previous changes that defined proposed Sites SUMA-11C and SUMA-12A as the primary sites for Expedition 362, two new proposed alternate sites have been selected: SUMA-23A and SUMA-24A. This addendum provides the scientific objectives for proposed Sites SUMA-23A and SUMA-24A, regional and detailed maps, and seismic profiles for the two sites. The site priorities and drilling and coring strategy remain unchanged from the original Expedition 362 Scientific Prospectus. The operations time estimates for all alternate sites are presented. The new proposed alternate Sites SUMA-23A and SUMA-24A are located above Fracture Zone 7B, which is located south of the current primary and alternate sites. The sites are located close to the epicenter of one of the 2012 Mw >8 earthquakes. These sites are still part of the input section to the southern 2004 earthquake rupture region of the subduction zone. Proposed Site SUMA-23A provides a section of Unit 1 (thin trench wedge) and a significant part of Unit 2 (Bengal-Nicobar submarine fan deposits and interbedded hemipelagite) overlying Fracture Zone 7B and includes sampling of 10 m of basement atop the basement high. Proposed Site SUMA-24A provides a section of Unit 1 (thin trench wedge) and a thinner part of Unit 2 (Bengal-Nicobar submarine fan deposits and interbedded hemipelagite) than proposed Site SUMA-23A, which overlies Fracture Zone 7B, and includes sampling of 10 m of basement atop the basement high. The new site survey data were acquired on board the Schmidt Ocean Institute (CA, USA) research vessel (R/V) Falkor in 2015 during the MegaTera experiment, an international project between the Earth Observatory Singapore (EOS), the Indonesian Institute of Sciences, Schmidt Ocean Institute (SOI), and Institut de Physique du Globe de Paris (France). SOI provided the R/V Falkor for the experiment, and EOS funded the rental of the seismic equipment. 
    more » « less
  4. null (Ed.)
    This addendum to the Scientific Prospectus of the International Ocean Discovery Program (IODP) South China Sea Rifted Margin Expeditions 367 and 368 (Sun et al., 2016) addresses a change of port-of-call and a two-day extension to Expedition 368 and modifications to some of the primary and alternate sites for both expeditions. As of the date of publication of this addendum, Expedition 368 is scheduled to start in Hong Kong on 9 April 2017 and end in Shanghai on 11 June. The two-day extension allows for the additional transit to Shanghai at the end of the expedition without taking time away from scientific drilling operations. 
    more » « less
  5. null (Ed.)
    Concerns about sea ice cover in the Amundsen Sea mandated the inclusion of many alternate sites for Expedition 379 in the original Scientific Prospectus (Gohl et al., 2017). The extraordinary ice cover in the Amundsen Sea during austral summer 2017/18 has prompted consideration of all possible alternates in case extreme sea ice conditions occur again in early 2019. In response to this, the following actions have been taken: 1. Four new alternate sites on the continental rise farther away from the sea ice edge of season 2017/18 have been added to the science and operational plans to maximize the range of options in the Amundsen Sea. These are proposed Sites ASRE-07A, ASRE-08A, and ASRE-09A on the eastern Amundsen Sea rise and ASRW-02A on the western Amundsen Sea rise (Table T1; Figure F1; see Site summaries). 2. Permission was obtained to occupy a range of locations along the seismic lines at each proposed site to provide for greater operational flexibility in case local ice conditions require it. These are presented in Table T2. 3. Alternative drilling areas in regions adjacent to the Amundsen Sea have been added in case the Expedition 379 operations cannot take place as planned. These include sites approved as part of International Ocean Discovery Program (IODP) Proposal 732 offshore of the Antarctic Peninsula and in the Bellingshausen Sea sites and sites in Ross Sea not completed during Expedition 374 (Figures F2, F3) (see McKay et al., 2017a, 2017b, 2018). These are proposed Sites BELS-01A, BELS-02C, BELS-03B, PEN-01B, PEN-02C, PEN-03C, PEN-04B, and PEN-05D, as well as RSCR-10A, RSCR-15A, RSCR-18A, and RSCR-19A (see Site summaries). 4. Although unrelated to sea ice issues, the approved depth of penetration has been increased for the following two Amundsen Sea sites: proposed Site ASSW-01B is now approved to 700 m, and proposed Site ASSE-03B is now approved to 1000 m. 
    more » « less