This presentation investigates the bromine closure over the tropical Central and Eastern Pacific Ocean, including an area where the MECCA-CAM global chemistry transport model predicts a global hotspot of BrO. This hotspot remains untested by previous field observations of BrO. Simultaneous measurements of gas-phase BrO, and size resolved aerosol bromide (chloride, sodium etc) have been conducted during the cruise component of the Tropical Ocean tRoposphere Exchange of Reactive Halogens and OVOC (TORERO) field campaign aboard the NOAA RV Ka'imimoana. These observations are used to infer total gas-phase Bry. Sea-salt bromide is found to be depleted in the aerosols relative to sea-water, consistent with the efficient bromine activation. However, very low gas-phase BrO observations below the detection limit (<<1 ppt) were observed, and are found to be inconsistent with the model. We conclude that a gas-phase process is missing that converts BrOx (= Br + BrO) into gas-phase Bry. Results from initial laboratory experiments to test this hypothesis are also presented. Collectively, the laboratory and field evidence point to existing bias in our perception of bromine sources, and provide a possible solution for the bromine conundrum over remote oceans.