Femke de Jong

@fmkdejong.bsky.social

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Physical oceanographer at the Royal Netherlands Institute for Sea Research (NIOZ). Measuring the Meridional Atlantic Ocean Circulation (AMOC). Interested in ocean, climate, diversity, sailing, creativity. Views my own. Posts in English and Dutch

Phote of the stage and screen at the Dutch Ocean Day conference. The slide shows a map with the setting of the sea battle of Actium in 31 BC. Helen is very energetically explaining how this battle transpired and how ocean conditions might have affected it
Grafieken met de tijdserie van 2014 tot 2022 op de OSNAP lijn. Bovenaan volume transport, dan warmte transport en onderaan zoetwater transport. De oranje lijn is het transport oost van Groenland, groen west van Groenland en de zwarte het totale poolwaardse transport
Doorsnede van de oceaan langs de OSNAP lijn met het zoutgehalte aangeven in kleur. Het minst zoute water, in het westen en aan het oppervlak, heeft een zoutgehalte van 34.85. Het zoutste water, dat uit de subtropen aangevoerd wordt in het oosten heeft een zoutgehalte van 35.5. Dat scheelt dus 0.65 gram per kilogram water
Foto van het centrale lab in het onderzoeksschip waar alle instrumenten klaar gemaakt worden om uitgezet te worden
Tekening van de OSNAP array die de oceaancirculatie tussen Canada, Groenland en Europa meet. De tekening is 3D en de verankeringen onder water zijn aangegeven met verticale lijnen met rode punten (instrumenten) en gele boeien.
Schematische tekening van een verankering. Verschillende instrumenten zijn bevestigd aan een lange kabel. Een anker met releases houdt deze op de bodem. Boeien (geel, oranje) houden de kabel omhoog
Een schematische tekening van de meetarray die door de Irmingerzee loopt. Je ziet een doorsnede van de oceaan ter hoogte van Groenland, met de stromingen en lokaties van instrumenten aangegeven
Foto van de Irmingerzee. Vanaf de blauwe railing van het schip uitzicht op een grijs wolkendek en een grijsblauwe zee met kleine golven
Photo of bundled up wires and sensors for sleep measurements. Electrodes for brain activity, breathing, heartrate, leg movement. Basically you are wired up like a robot, or hospital escapee
Photo of a pond in the park. There are rectangular structures in the water, that likely represented the shape of a harbour.
Photo of a test basin. There are rail tracks over the water that carry a measuring bridge, which could carry instruments and scientists
Photo of a lab space inside. Still mainly empty workbenches, screens and large viewing ports
Photo of the Anna Weber van Bosse from the side. A blue hull labeled “Sea research” and a white top. She has many cranes for putting oceanographic equipment in the water and masts for meteorological sensors
Video of the christening of the research vessel. Looking at the bow of the ship with the vessel’s name Anna Weber van Bosse against which a bottle of champagne is crashed through a tipping mechanism
Photo of research vessel Pelagia in the NIOZ harbour.
Photo of a rainy and cloudy Marsdiep with a vessel in the back. It is supposed to say “sea research” on the side of the vessel, but you can’t read it from here
Photo looking at the back of the sailboat sailing on the IJsselmeer. Lots of wind turbines in the background
Photo looking forwards on a sailboat
A photo taken looking upwards. We see blue sky with some small clouds and a sun halo around the top of the mast of a sailboat
Video looking forward on a sailing sailboat
Small wooden cabinet inside a boat. The cabinet holds one item, a small allen wrench. The type used for ikea furniture
Inhoudsopgave van het jaaroverzicht.
Photo of the CTD rosette on research vessel Pelagia. Electronic sensors are located in the middle, samplers on the outside. This CTD rosette is lowered over the side of the vessel down to the ocean floor to measure the water properties
Monthly global mean atmospheric CO2 column-averaged concentration from satellites for 2003-2024 and the 12-month average. Data source: C3S/Obs4MIPs (v4.6) consolidated (2003–2023) and CAMS preliminary near real-time data (2024) GOSAT-2 records. Spatial range: 60°S-60°N over land.
Graph of global average temperature increase compared to the mean temperature of the 1850 to 1900 preindustrial period. The graph shows a steep increase in temperature since 1970, with 2023 and 2024 being the warmest years.
Photo of the cover of the printed PhD thesis of Nora Fried, who was a PhD student at NIOZ. The title is “Hidden below the surface. On the pathways, interactions and transport variability of the Irminger Current.” The cover shows moorings below the ocean surface and the research vessel Pelagia at the surface.
Photo of a sailboat on calm water with sunshine in the background
12 slices of bread (arranged 3 by 4) all with different kinds of chocolate sprinkles. From dark chocolate to white chocolate to mixed
Set up for the workshop. Each two participants shared a table with burner, tweezers and lots of glass
My office table with several moored instruments to practice with (a current meter, thermistor and microcat), cables to connect, laptop and lots of mooring diagrams and manuals
Photo from the dike in Den Helder looking at two sailboats
Photo of the opening slide at the meeting of the first Dutch National Ocean Science Conference
Five flower petals cut out of silver sheet
Photo of the bike racks at the beach that have just been dug out of the sand. They get completely covered in winter
Photo of the beach in Den Helder. The sea is still calm, but the clouds are dark gray and threatening
Screenshot of buienradar, the Dutch weather radar app. The Netherlands is orange in the map, not the usual green. There’s a lot of rain coming towards us from the North Sea
Photo of the introduction screen at the NWO Polar Day 2024
Screenshot of a video I made for a class. Using red dye in warm water and blue dye in ice cubes to make show a circulation that resembles the Atlantic Meridional Overturning Circulation in a fishtank
Photo of the poster session, with rows of poster boards along the two sides and people engaging in interesting discussions
Screenshot of EGU program. Summer fresh layers and winter mixed layers in the western Subpolar Gyre by Femke de Jong and Nora Fried
Screenshot of EGU program. Oral presentation “Greenland Tip Jet in the future: Declining heat loss in a high-resolution CESM simulations” by Aleksandr (Sasha) Fedorov, Claudia Wieners, Femke de Jong and Henk Dijkstra
Photo of the EGU entrance with a giant (20x5m?) blue screen above the doors saying Welcome to EGU
Photo of a corner of the park where there’s perfectly straight beech hedges as well as perfectly round spheres
Photo of the view of castle Schonbrunn from Neptunes fountain
Photo of Richard Engelen presenting Copernicus: working with or within the EU's Earth ObservaMon programme
Photo of Gennadii Donchyts presenting Google Earth Engine - a plaGorm for planetary-scale earth science data & analysis
A photo of Ilse Aben presenting How satellites can support to reduce methane emissions – focus on super emitters
First slide of the Dutch EO Day showing a satellite image of the Netherlands
Photo of Trevor’s summary slide, recapping the most important equations of the abyssal ocean stratification.
Photo of the commissioners room in a Den Hague society. The room is decorated extensively, trimmings, draped curtains, chandelier, but the best is the painting of the sky with clouds on the ceiling.
Photo of a sailboat sailing along a shoreline with reeds
Snap of the program. Opening at 10:30, the invited talks mentioned above before lunch and discussions in breakout sessions after lunch. We end with a satellite image competition award.
Photo of the optimare salonimeter standing on the lab bench
Banner of the NAC standing at the stair entrance
Map of catchment areas of rivers in the Netherlands. The largest is that of the Rhein, that extends far into Germany.
Population density map of the Netherlands. Along the west coast are areas with densities up to 2560 people per square kilometer. In the east there are less cities and densities are around 80 to 320 people per square kilometer.
Topography map of the Netherlands. Most of it is blue and green, which is up to 6m above current sea level. There is some higher topography in the east.
Photo of the research vessel Wim Wolff at the jetty for the christening ceremony.
Google scholar wordle of my research papers. Biggest words are Irminger Sea, Atlantic overturning variability, ocean currents
A1E section from World Ocean Circulation Experiment gallery. Shown on top is salinity with map of section inset