Motivations and Themes:  The tropical Pacific is a keystone region for global climate and ocean BGC, as largest source of carbon to atmosphere, home to the largest OMZs and a highly productive and biodiverse ecosystem and fisheries. The coupling of ocean BGC to climate and ocean physics is poorly understood. Ocean BGC are particularly sparsely sampled, and ocean model BGC biases are large and persistent.  There has been no coordinated observing efforts since the Joint Global Ocean Flux Study (JGOFS) or major reviews, but many updates and progress, e.g. by the Tropical Pacific Observing System (TPOS) and BGC Argo program.

Several overarching questions arise from these gaps, and are explored by this working group, including:

1. How does tropical Pacific climate and ocean dynamics modulate ocean biogeochemical cycles?
2. How does tropical Pacific ocean biogeochemistry, in turn, affect ocean circulation and climate?
3. How can biogeochemical tracers inform our understanding of climate and physical ocean processes?

Mission & Goals:  The TP BGC PIs Working Group aims to bring together the community across physical and biogeochemical disciplines to identify and advance research questions and observing and modeling needs for understanding ocean biogeochemical (BGC) cycles and their interactions with climate and ocean dynamics in the tropical Pacific. Specifically, this working group aims to:

1. Identify key research questions and gaps in our understanding of ocean BGC and physical interactions in the tropical Pacific, including observing and modeling challenges, needs, and priorities
2. Identify opportunities and recommendations for addressing these gaps and needs, including coordinated model experiments, sustained observing network and process studies (beyond TPOS)
3. Promote community interactions and collaborations on these themes via i) seminars and discussions, ii) review of literature and a synthesis paper, iii) and conferences sessions.

Working Group Members:

1. Yassir Eddebbar (Co-Chair)  Scripps Institution of Oceanography. CLIVAR PRP member [USA]
2. Sayaka Yasunaka (Co-Chair) University of Tohoku. CLIVAR PRP member [Japan]\
3. Sophie Cravatte: IRD Noumea. CLIVAR PRP Co-Chair [New Caledonie]
4. Pete Strutton: University of Tasmania [Australia]
5. Tomoki Tozuka: University of Tokyo [Japan]
6. Dan Whitt: NASA Ames [USA]
7. Enhui Liao: Shanghai Jiao Tong University [China]  
8. Shoshiro Minobe: University of Hokkaido [Japan] 
9. Sam Stevenson: UC Santa Barbara [USA]
10. Antonietta Capotondi: CU Boulder. CLIVAR PRP member [USA]