JETZON - Joint Exploration of the Twilight Zone Ocean Network

JETZON - Joint Exploration of the Twilight Zone Ocean Network

JETZON is a UN Ocean Decade Programme, acting as an international coordinator and focal point for Twilight Zone studies

The ocean's Twilight Zone, the dimly lit region extending from a few hundred meters depth to 1000m, is still poorly understood from almost any perspective, whether physics, biochemistry or ecology. However, it contains possibly the world's largest and least exploited fish stock and is responsible for recycling roughly 80% of the organic material that enters the ocean's interior from productive surface waters. The former has drawn attention due to an increasing demand for resources from a growing world population. There is therefore a pressing need to understand the consequences of perturbing this ecosystem.

JETZON was set up to address the question: how can we as an international scientific community obtain the greatest insight into the Twilight Zone from ongoing work and how can we maintain focus on this potentially threatened environment?

JETZON aims to bring together all researchers in the field, from PhD students to those involved in, and leading large multi-national projects.

Linked projects


UN Ocean Decade Linked activities



  • PACE NASA's Plankton, Aerosol, Cloud, ocean Ecosystem mission

Other linked activities


SCOR Working Groups

  • ReMO Respiration in the Mesopelagic Ocean: Reconciling ecological, biogeochemical and model estimates
  • TOMCAT Translation of Optical Measurements into particle Content, Aggregation & Transfer


A little background

JETZON has its origin in the BIARRITZ (Bridging International Activity and Related Research Into the Twilight Zone) workshop in July 2019, funded by the National Environmental Research Council (UK), NASA, OCB, and SCOR. The workshop brought together 13 international projects tackling aspects of the Twilight Zone's role and function, from viruses to fish. Early career researchers from outside the project also participated in the workshop.

JETZON launched at a Town Hall Meeting on February 20, 2020 at Ocean Sciences, San Diego (see here for the slides from the meeting). Thank you to all those that joined us for participating.





- Call for new UN Ocean Decade Projects. Information for linking to JETZON.

- New Jobs and Posts page - see below.



Jobs and posts

Find them here



Open monthly Zoom calls

Next call - 22 February 2022 at 1200 AEDT (0100 UTC) - please note time

# DNA metabarcoding analysis of salp diet diversity in the NW Atlantic mesopelagic food webs - Paola Batta-Lona (University of Connecticut)

# Remote assessment of export of distinct biogenic carbon pools in the ocean - Yibin Huang (NOAA/PMEL))

Register here

Notes and recordings from previous calls



Data and method sharing

More here



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