A few thoughts (without the bass in front of me) -
(1) On any given note the further the contact point is from the bridge then the faster the bow must move to support the string vibrations.
(2) Bow contact point will be important and should move to follow the rising or falling notes. In theory the lowest notes should use less bow than the high ones however the string vibrates faster as pitch rises and needs faster bow speed to support tone and projection. In reality the notes might end up each needing the same length if the contact point does move.
(3) I would try starting the up bow with the contact point as close as practical to the bridge so that each little up-stroke can be shorter. This will depend on your bow quality, bass, rosin and strings.
(4) The first beat requires a much faster moving whole bow stroke than the following up bow. There needs to be a feeling of physical balance during the abrupt change in order to control the shape and dynamics.
(5) If I do not wish to accent the first dotted eighth notes then I will start them at almost normal speed to set the string in motion before I release the weight and stretch quickly towards the point of the bow, just brushing the string enough to maintain the sound.
(6) I separate the sixteenth note slightly, giving it its own short down stroke with the idea that this note belongs to the following ones, not the previous dotted note. It is this separation that gives me the balance to control the following multiple short staccato up bows.
I suggest first playing one note backwards and forwards in a number of steps before introducing the sixteenths into the scale. With a metronome set at about 80bpm play a quarter note down bow followed by a three-beat up bow that shows you the down bow will move approximately three times faster than the up bow. Then introduce the sixteenth note into the end of the first beat. Still on one note introduce the up bow staccato gradually, first in groups of 4 notes per bow then 8 notes and 12 notes.
I might think of the large almost steady arm movement taking three beats while the wrist and fingers combine to produce the small separate movements like a series of catch-ups with the arm. Alternately I would work on developing small twitches in the biceps with relaxed flexible fingers and wrist to develop the short movements.
I must get onto my own bass to confirm the above!